“…Also, inherent to research in the dialysis setting, attrition rates were substantial in many studies. Frequently subjects that did not complete follow-up were different from subjects that did complete follow-up [ 17 , 24 , 32 , 33 , 36 , 38 , 41 , 42 ] or were not described sufficiently [ 18 , 21 , 23 , 25–30 , 34 , 36–40 , 43 ]. In three publications, renal replacement therapy was described as ‘dialysis, not otherwise specified’.…”