#NephMadness 2017: Dialysis Region

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Selection Committee Member for the Dialysis Region:

Jonathan Himmelfarb

Dr. Himmelfarb, MD, is Professor of Medicine, Director of the Kidney Research Institute, and holds the Joseph W. Eschbach, MD, Endowed Chair in Kidney Research at the University of Washington School of Medicine.  For three decades he’s been a leader in clinical and translational research focused on kidney disease, and has authored 200+ peer-reviewed publications.

Basketball has James Naismith and his peach baskets. Nephrology has Wilhelm Kolff and sausage casings. We still call the hoops baskets even though they are nylon and aluminum. And nephrology is still largely synonymous with dialysis. It, along with transplant, is the shining achievement of our specialty. But despite this success it is not perfect and some of the gaps are areas not easily seen or do not get the attention they deserve. With that introduction I give you the categories in the dialysis section:

Competitors for the Dialysis Region

Kt/V Urea vs Depression in Dialysis

Neurocognitive Declines in Dialysis vs Patient Reported Outcomes

In the late seventies and eighties one of the most exciting basketball teams was the Jerry Tarkanian-led UNLV Runnin’ Rebels. They only joined division I basketball in 1970 but just 7 years later they made the Final Four. In 1987, the Rebels again reached the Final Four, this time with only a single loss. They won the tournament over Duke in 1990. Since then, things have been a bit thin with probation and suspensions and string of less successful (and iconic) coaches. The Rebels have managed only one trip to the Sweet Sixteen since 1991. Kt/V urea is the UNLV Runnin’ Rebels.

Kt/V Urea

For fifty years dialysis has been saving and improving the lives of people with kidney failure. Without dialysis, ESKD is universally fatal. In ESKD the kidneys are unable to excrete the waste products of metabolism so they accumulate and cause uremia. Dialysis removes these waste products, or solutes, to maintain equilibrium between their generation and removal. The dose of dialysis is a measure of how much solute to remove so that patients maintain solute equilibrium.

The first attempt at developing a system for measuring and administering a dose of dialysis was the National Cooperative Dialysis Study (a 16-seed from the very first NephMadness). The NCDS randomized patients to two mid-week pre-dialysis BUN levels and two durations of treatment in a 2×2 design. BUN levels were used to represent low molecular weight solute and time was supposed to be proxy for middle molecular weight solutes. The trial looked like this:

The study was plagued by lots of dropouts for various reasons, but at the end of a year removal for death or medical reasons broke down like so:

This showed that low BUN was important, with a less clear signal for time. A secondary end point was observed versus expected time to first hospitalization.

Lower BUNs were clearly more important here, with P<0.0001. Time was NS with possibly the most significant non-significant P value ever at 0.06.

The NCDS data were then used by Sargent (senior author of the paper) and Gotch in A Mechanistic Analysis of the National Cooperative Dialysis Study four years after the NCDS paper was published. This study created Kt/V to explain the inconsistencies and confusion of the NCDS study which was confounded by sick patients who weren’t eating reaching the low mid-week BUN targets with minimal dialysis. Vanholder et al, described this moment:

With the introduction of Kt/Vurea, adequacy of dialysis was no longer assessed by a single static pre-dialysis value, of which the low concentration could be due to negative confounders such as low protein intake for urea or low muscle mass for creatinine. Kt/Vurea instead is a dynamic parameter that assesses removal by dialysis as a whole (Kt), including not only clearance but also dialysis length and above all a correction for body mass (V). 

Gotch and Sargent’s newly minted Kt/V showed that levels less than 0.8 were clearly associated with harm. Additional observational data was used and a target for Kt/V became 1.2.

Even with the newly standardized dose of dialysis, outcomes were still unacceptable and doctors logically looked to higher doses of dialysis to improve outcomes. This theory was tested in three landmark randomized controlled trials in nephrology:  HEMO, ADEMEX, and ATN.


In all three studies, increasing the dose of dialysis, as measured by Kt/V urea, did not improve outcome. So that leads to the question of what’s next? Is there a better way to measure dialysis that could guide us to more effective dialysis and better outcomes for our patients?

Uremic Solutes

The list of substances that accumulate – “uremic toxins/solutes” – keeps growing every year. In a recent review Neirynck, Vanholder, and others identified several uremic toxins – limiting themselves to the ones that have a known adverse effect on the cardiac function. This review is notable because it included toxins produced by gut bacteria and also alternative methods of clearing these toxins including dialytic manipulations, prescriptions, dietary changes, and alterations to gut microbiota. A database of uremic toxins is available online.

Uremic solutes are categorized by aspects of dialysis clearance:

  • Small Solutes – Water soluble, with an arbitrary upper limit of 500 Da. They are easy to remove by any dialysis strategy – urea is the prototype of this class.
  • Larger Middle Molecules (> 500 Da) – These are removed only by high-flux membranes – Beta-2 microglobulin is typical of this class.
  • Protein-bound molecules (< 500 Da) – Smaller molecules but bound to proteins and difficult to remove. The most extensively studied markers in this class are indoxyl sulfate and p-cresol conjugates.

Small Solute Clearance – Similar to Urea but different.

Urea is the prototypical small solute, but it seems unlikely that it causes uremic symptoms at the concentrations encountered with modern dialytic techniques. In 1972, Johnson et al. added urea to the dialysate for 3 months, resulting in elevated pre-dialysis urea. The results are pretty remarkable:

It was not until a value in excess of 300 mg/dl of urea (BUN of 140 mg/dL) was obtained that vomiting became a constant feature. Headaches usually occurred as well. Bleeding from cannula site, nasal and oral mucosa, and subcutaneous tissue occurred within a week of urea loading. Values in excess of 400 mg/dl (BUN 187 mg/dL) produced malaise and lethargy, but no somnolence, mental slowing, or depression.

So it is clear that urea causes uremic symptoms but it was only at levels far in excess of what we see today. However there is some animal research showing the urea levels encountered in dialysis can increase free radical production and insulin resistance. Other small molecules such as the guanidines are known to be have both neuro- and cardiotoxicity.

α-Keto-δ-guanidinovaleric acid α-N-acetylarginine
Asymmetric dimethylarginine (ADMA) Argininic acid
Β-Guanidinopropionic acid Creatine
Creatinine Γ-Guanidinobutyric acid
Guanidine Guanidino acetic acid
Guanidinosuccinic acid Methylguanidine
Symmetric dimethylarginine (SDMA) Taurocyamine

The volume of distribution of guanidines is larger than urea, limiting their dialytic removal. Meyer et al examined stored samples from the HEMO study to identify the relationship between higher urea clearance and removal of non-urea small solutes. This study showed that there was a  9% increase in urea clearance between groups, and the change in levels of non-urea small solutes ranged from no change (p-cresol, ADMA) to significant reductions (trimethylamine oxide, indoxyl sulfate, and methylguanidine.) All-cause mortality did not relate to the levels of any of the solutes. The authors concluded that the clearance of urea did not represent the clearance of uremic toxins.

The most effective way to increase the removal of guanidines is to increase duration of dialysis. Other molecules with smaller volumes of distribution, like guanidosuccinic acid, require more frequent dialysis. A combination of longer and more frequent dialysis is the best way to increase guanidine’s clearance. 

Vanholder and others listed some of the limitations of Kt/V

Kt/V is not the only or most consistent determinant of dialysis outcomes Increasing Kt/V does not improve outcomes
Urea itself as being toxic is still debated Dialysis kinetics of urea is dissimilar to other uremic retention solutes
Urea kinetics do not completely explain or account for large pore dialyzers or convection Urea kinetics do not completely account for extended dialysis
Urea kinetics do not take into account the intestinal generation of uremic toxins Kt/V urea does not completely account for residual renal function
Kt/V urea does not reflect UF rate which has a role in outcomes Kt/V urea does not account for electrolyte disturbances which may have a role in cardiovascular outcomes

If not Kt/V urea, what other measures might be considered appropriate? In his review of Kt/V, Daugirdas lists advantages and disadvantages of other HD adequacy metrics –  

Measure Advantages Disadvantages
Kt/V urea Easy to measure, NCDS data supports a MINIMUM dose Small , easily dialyzable, not representative of other solutes, and increasing Kt/V did not improve outcomes
StdKt/V May overcome disadvantage of Kt/V by being more representative of removal of uremic toxins, frequency and volume are better represented Long interdialytic periods not captured in this metric; large molecules removal is time related and frequency may not have added advantage
HD product Gives weight to frequency Similar to StdKt/V but without accounting for clearance
Weekly time May reflect salt and water control, and ensures smaller patients get adequate dialysis No clearance term; some toxins may not be adequately dialyzed
Square-Meter-Hour Salt, water clearance, adequate dialysis irrespective of size and has clearance term Increased frequency is not represented
Substitution fluid volume (HDF) ?>21 L/treatment has better outcomes Data from secondary analysis of RCTs
Maximum UFR Observed high UFR increases morbidity No RCT, and not clear which is the best way to reduce UFR – increasing frequency of HD or duration of HD
Maximum interdialytic period 3-day interval is bad May not be important if RRF is good


In conclusion, Kt/V urea is not a marker for non-urea uremic solutes. There are several solutes that behave quite differently than urea and one size fits all (Kt/V urea > 1.2 per session) is too simplistic to measure dialysis adequacy. We have not yet identified a single marker of adequacy and it is unrealistic to expect a single molecule clearance to represent the vast diversity of the uremic milieu.

Depression in Dialysis


Depression is the most common psychiatric illness in patients on dialysis. Compared to the general population depression is much more prevalent in dialysis: up to a fifth of dialysis patients have depression (Palmer et al). The prevalence is higher in females than males (Kimmel et al).

Adapted from Kimmel et al, ACKD, © National Kidney Foundation

Diagnosis of Depression

The 3-point field goal came to college basketball in 1980 and by 1987 it was a part of the Big Dance. But despite that early entry, its role was underappreciated for decades. It wasn’t until after the turn of the century that the 3-point field goal became the weapon that it is today. If you look at the 10 players with the most 3-pointers, 9 of them played after 2000. It was always there but for some reason we have only really incorporated it recently. Depression in dialysis has always been there but similarly we have only just become aware of it.

DSM-IV Criteria for Major Depressive Disorder (MDD)

  • Depressed mood or a loss of interest or pleasure in daily activities for more than two weeks. Mood represents a change from the person’s baseline.
  • Impaired function: social, occupational, educational.
  • Specific symptoms, at least 5 of these 9, present nearly every day:
    1. Depressed mood or irritable most of the day, nearly everyday, as indicated by either subjective report (e.g., feels sad or empty) or observation made by others (e.g., appears tearful)
    2. Decreased interest or pleasure in most activities, most of each day
    3. Significant weight change (5%) or change in appetite
    4. Change in sleep: Insomnia or hypersomnia
    5. Change in activity: Psychomotor agitation or retardation
    6. Fatigue or loss of energy
    7. Guilt/worthlessness: Feelings of worthlessness or excessive or inappropriate guilt
    8. Concentration: diminished ability to think or concentrate, or more indecisiveness
    9. Suicidality: Thoughts of death or suicide, or has suicide plan

The best screening tool for depression in patients on dialysis is uncertain. The three most validated and most commonly employed questionnaires are:

  1. The Beck Depression Inventory (BDI)
  2. The Patient Health Questionnaire (PHQ-9)
  3. The Center for Epidemiological Studies Depression Scale (CESD)

The gold standard is the Structured Clinical Interview for DSM disorders (SCID), preferably administered by an experienced psychiatrist.

Test Item (Score Range) Cut-off for diagnosis in ESKD Sensitivity and Specificity
BDI 21 (0-63) ≥ 14-16 62-91%; 81-86%
PHQ9 9 (0-27) ≥ 10 92%; 92%
CESD 20 (0-60) ≥ 18 69%; 83%
Adapted from Hedayati SS, Yalamanchili V, Finkelstein FO. Kidney international. 2012;81(3):247–255.

Despite those statistics, a recently completed RCT on depression therapy enrolled patients by screening them with the BDI followed by a psychiatrist evaluation and found the specificity to be less than 60%.

One of the factors complicating the screening and diagnosis of depression is the overlap of symptoms of ESKD and depression. Of the 9 specific symptoms, five could equally be a symptom of ESKD:

  1. Weight change
  2. Change in sleep
  3. Change in activity
  4. Fatigue
  5. Diminished concentration


Depression can diminish every aspect of patients’ lives. Depression can lead to functional impairment, strained relations, and difficulties with adherence to medication, diet, and dialysis plans. And most concerning it can lead to self harm and suicide. In an observational study it was shown that the probability of hospitalization was 12% higher in dialysis patients who were depressed as compared to those who were not. Depressed dialysis patients also remained hospitalized longer (Lacson et al). In addition, the presence of depressive symptoms is strongly linked to mortality (HR, 1.51; 95% CI, 1.35-1.69) based on 12 studies as published in a meta-analysis by Farrokhi et al.


Most of the data used to generate treatment decisions in depression in ESKD comes from observational studies. RCTs in this area are sparse. One of the few RCT is the recently completed Sertraline versus Placebo in Patients with Major Depressive Disorder Undergoing Hemodialysis trial. This was the largest randomized controlled trial of antidepressant medication in dialysis patients ever. It screened over 700 patients and had only 21 complete 6 months of therapy. Let me repeat that, the largest randomized controlled trial of antidepressant medication in dialysis patients had only 21 patients complete 6 months of therapy.

The study did not show any benefit of sertraline as compared to placebo, but the authors are the first to recognize that their results may not be representative. Nearly a third of patients who tested positive for depression were already on an antidepressant medication. Additionally patients on placebo had a brisk and steady recovery throughout the study period (P<0.001).

One of the more effective therapies for depression is Cognitive Behavioural Therapy (CBT). In a study from Brazil, use of CBT over 9 months improved BDI scores from 25 to 11 in the treatment group versus 25 to 18 in the control group. But the questions remain, including where and when to administer it. Bedside CBT during dialysis sessions is being explored. Pharmacotherapy is easy to administer, but drug interactions and adverse effects in the setting of ESKD are not predictable. It is not clear what works, what does not work, and what causes harm. The ASCEND Trial (A Trial of Sertraline vs. Cognitive Behavioral Therapy for ESKD Patients with Depression), a multicenter RCT, will hopefully be able to provide answers.

Another observation comes from a secondary analysis of the SMILE trial (Symptom Management Involving ESKD). As part of this trial, a study nurse evaluated patients on a monthly basis and scored them on a number of axes, one of which was depression. As part of the trial, protocols were developed for the management of these symptoms. Pena-Polanco’s analysis looked at how agreeable patients and providers were to suggestions to initiate or intensify depression therapy. In patients who screened positive for depression:

  • And who were not on anti-depression therapy, 91% rejected suggestions to initiate medication or go for a psychiatric evaluation.
  • Who were already on therapy, 73% refused to intensify the therapy by changing dose, changing drugs, or psychiatric evaluation.

In the minority of cases where patients wanted and accepted additional therapy, the physician would often block therapy. In 61% of the recommendations the provider did not accept the recommendation to increase the dose, change the drug, or refer to a psychiatrist.

As an alternative to medications there are studies that have suggested improved in the symptoms by –

  • Alteration of dialysis treatment –
    • FREEDOM study of patients undergoing daily dialysis on the NxStage system where the BDI scores improved from baseline values of 11.2±0.8 to 7.4±0.6 at 4 months, and this improvement was sustained at 12 months. The study was limited by a large dropout rate (of 239 participants, 111 discontinued for various reasons, most commonly being a modality switch or return to in-center dialysis).

Figure 1 from Jaber et al, AJKD, © National Kidney Foundation.
Effect of daily HD on BDI score at 4 and 12 months in participants with baseline moderate to severe depressive symptoms (BDI score >15). P < 0.001 for both intention-to-treat and per-protocol subcohorts using repeated-measures analysis of variance for testing time effect. Error bars represent the 95% confidence interval.

    • In the FHN trial there was improvement in the RAND-36 physical-health composite score of 3.4±0.8 in the frequent dialysis group; the corresponding change in patients in the conventional-HD group was 0.2±0.8 (P=0.004).
  • Exercise therapy – A few studies (Johansen et al, Kouidi et al) demonstrated improvement in depressive symptoms and scores with exercise therapy.

Many depressive symptoms are worsened around an acute medical or social event, so maybe the correct answer is to “ride it out” without changing the mental health regimen but perhaps patients would really benefit from intervention at those moments. With so little prospective research it is hard to know the right answer.

The conclusion is that we do not have a conclusion. We do not know how many of our patients are depressed. We do not know how badly it affects their quality of life, adherence, and outcomes. We do not know how ESKD and depression affects the caregiver and the family dynamic. As always the last line in papers is – more RCTs needed – but as demonstrated by Friedli et al – it is not always easy.

Neurocognitive Declines in HD

Doctors have recognized that kidney failure causes cognitive impairment over the last 150 years. Though we don’t see the severe impairment described by Dr. Addison due to modern renal replacement therapies, that doesn’t mean our patients are spared this complication.

With increasing emphasis on incorporating patients’ desires and wishes into the medical plan it is now more important than ever to recognize the problem of cognitive impairment in CKD and dialysis. How can we have meaningful conversation about conservative care if the patient does not have the cognitive function to process the choice?

Cognitive impairment is approximately equivalent to mild dementia. Dementia is defined by DSM IV as chronic impairment in two or more cognitive domains (executive function, aphasia, apraxia, agnosia) that substantially affects daily functioning. It must represent decline in premorbid function and not be due to acute delirium.

Cognitive impairment (CI) is underrecognized by the dialysis community in general. There are several studies (REGARDS study, Murray et al, CHS Study) that show high prevalence of CI in CKD and dialysis.

Rakowski et al demonstrated that dialysis patients with dementia/CI had decreased 2-year survival on dialysis (P<0.001).

From a sample of 338 dialysis patients nearly 70% of patients had moderate to severe degrees of CI. Despite these staggering numbers, only 3% had a documented history of CI.


There is no “gold standard” for the diagnosis of CI in dialysis patients. To give an example – in a recent systematic review and meta-analysis by O’Lone et al from Australia,­­­­­­­­­­­­­­­­­­­­­ 54 different tests were used in the 42 studies that were included in the systematic review! The most commonly used tests are:.

Most frequently used test for this domain Domain Tested Trials testing this domain (out of 42) Number of tests used to measure this domain
TMT A and B Orientation and attention 33 33
WMS Memory 24 38
Clock and GPB Construction and Motor 13 13
Stroop test Executive function 12 11
Progressive matrices Concept & Reasoning 10 11
HVLT Language 8 9
Halstead Reitan Perception 4 5
MMSE Global 27 12

Often these studies are of modest size but more concerning is that they have exclusion criteria that limit the applicability to the general dialysis population. In a recent study by Neuman et al, nearly half of eligible patients were excluded from cognitive testing because of visual, motivational, or motor difficulties. They concluded that cognitive testing could be improved by further testing using non-visual and nonverbal testing to better characterize the entire at-risk population.

Cognitive impairment can be vascular or nonvascular in nature. And cognitive dysfunction can be both acute and chronic. The risk factors for dementia in the general population: advanced age, diabetes, hypertension, dyslipidemia, stroke, anemia, inflammation, poor diet, and lack of exercise are all commonly found in CKD patients. In addition, CKD patients are at high risk for future vascular events. Together this drives up the incidence of vascular dementia. Additionally, patients on dialysis have increased microinfarcts and white matter changes which likely contributory to CI. Most individuals with CKD are also at risk of accelerated decline in cognitive function due to specific factors inherent to renal failure, including anemia and uremia.

The process of dialysis itself may contribute to a worsening of CI, either by causing large, rapid shifts in fluid and urea (dialysis disequilibrium) or by causing intradialytic cerebral hypoperfusion and hypoxia associated with changes in circulating volume. 

Overall as shown in the figure below, it is obvious that cognitive impairment in CKD is multifactorial and complex.

Adapted from Murray AM, ACKD, © National Kidney Foundation.

Koushik et al in an older review presented a review of cognitive testing in all stages of CKD. HD and PD patients both showed poorer cognitive function when compared to the general population. Measurement of cognitive function in HD patients is complicated by timing. Most tests showed better results when testing was done after HD sessions (best on the day after) with the worst results right before HD. PD patients did not have such fluctuations. In another study, the testing CKD5 patients not on dialysis (either awaiting a start or on conservative care) had poorer cognitive status than similar patients on dialysis.

If we do not realize or accept that something is broken then there is no incentive to fix it. Cognitive impairment  is not new, but it is an area that is now increasingly being recognized as being an important problem. Once we accept that our CKD/HD patients have significant CI, we can design better studies to identify the causes and further methods to prevent, delay, or even treat this. This area is often neglected and needs to be brought into sharp focus.

Cognitive function directly affects our patients’ quality of life and decision making ability, limits their ability to cope with a debilitating chronic disease, is a constant source of anxiety, and ultimately affects their survival. We need to put the patient first and recognizing cognitive dysfunction is a start in the right direction.

Patient Reported Outcomes

Treatment of end-stage renal disease has evolved over the last 50 years and more from being a lifesaving therapy for acute kidney injury to a maintenance therapy for patients with ESKD. Despite advances in HD, outcomes are not ideal. Using a reductionist model to improve outcomes has resulted in nephrologists working to improve a host of surrogate outcomes, hemoglobin, phosphorus, albumin, Kt/V, etc. Many (most? all?) of which have not been validated to improve dialysis outcomes.

Not only are doctors desperately chasing after unvalidated outcomes, they are doing this instead of pursuing outcomes that patients care about. Patients with CKD prioritize quality of life, mental health, impact on family, fatigue, and employment. These are outcomes are rarely considered in dialysis research: when evaluating a therapy that may affect an unvalidated outcome, we don’t even get the data on how it affects the outcomes patients care about.

So, what matters to the patient on dialysis? In a study from Australia and Canada, Rachel Urquhart-Secord and others conducted a survey to identify and rank outcomes from patient and caregiver perspectives. Fifty-eight patients and 24 caregivers participated. The scores for patients, caregivers and both are shown in the chart

Figure 1 from Urquhart-Secord et al, AJKD, © National Kidney Foundation.
Mean rank scores for outcomes identified in at least 4 groups. ∗Resilience/coping was originally termed “survival” by patients/caregivers but has been re-termed for clarity of definition; washed out and drained was defined as “feeling sick, drained, tired after dialysis or recovery time after a dialysis session,” and fatigue/energy was defined as “feeling tired and without energy for most of the time”; cardiovascular disease included any disease of the heart and blood vessels (eg, heart attack, stroke, blockage of blood vessels).

Look at the disparity in mortality and ability to work between caregivers and patients.

Patients want to live well. They want to improve day-to-day functioning, be gainfully employed, they want to feel awake in the morning – not wasted. They want to travel and “be normal”. The other aspect of outcomes that became very obvious was that patients want their immediate issues to be dealt with rather than worry about potential long-term outcomes.

Patients rate immediacy of their symptoms more highly than the intangible biochemical outcomes. Especially when in an effort to improve the numbers, physicians change the dialysis prescription. Patients struggle with loss of autonomy. Patients feel a tangible loss of quality of life in order to gain an intangible improvement to a number.

In 2014 the international Standardized Outcomes in Nephrology (SONG) initiative was formed to develop consensus, patient-oriented, outcomes across CKD. The goal of SONG is that once the goals are established future HD research, even if focused on a small area or surrogate outcome would include these patient oriented outcomes. The authors put it this way:

Engaging all stakeholders in establishing a core outcome set, an agreed minimum set of standardized outcomes to be measured and reported in all trials for a particular clinical area, can increase the relevance, efficiency, and reliability of trials.

The first step for SONG was establishing a core set of outcomes. This was done with a Delphi survey (invented by the RAND corporation in the 50s) a validated approach to developing consensus-based core outcomes for clinical trials in various medical specialty areas.

Figure S1 from Evangelidis et al, AJKD, © National Kidney Foundation. SONG-HD Delphi process
Mean rank scores for outcomes identified in at least 4 groups. ∗See previous figure above.

The survey process used 202 patients and caregivers and 979 health professionals from 73 countries. Despite this iterative system the results were surprisingly stable from round to round. The final five highest priority outcomes were:

  1. Vascular access problems
  2. Dialysis adequacy
  3. Fatigue
  4. CVD
  5. Mortality

Of note, dialysis adequacy was highly rated by patients and caregivers. On discussion it became apparent that “dialysis adequacy” was interpreted as a broad quality-of-life outcome (ie, dialysis that is adequate for enabling patients to feel well) rather than quantification of urea kinetics.

Doctors need research to improve the health and wellbeing of patients and every research study requires an outcome to measure. Too often these outcomes have been selected by physicians and were not relevant to patients. The coordinated and cooperative efforts of SONG-HD to generate consensus outcomes will enable studies to be comparable and more meaningful for people on both ends of the dialysis needle.

– Post written and edited by Nikhil Shah (dr_nikhilshah).

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