For citations:
Zemchenkov A.Yu., Sabodash A.B., Omelchenko A.M., Kulaeva N.N., Sadovskaya D.S., Rumyantsev A.Sh. Survival analysis for older and frail patients starting dialysis and external validation of the REIN scale. Nephrology and Dialysis. 2018;20(4):357-365. (In Russ.) https://doi.org/10.28996/2618-9801-2018-4-357-365