S-Crea, S-Cys C, and eGFR after DN: multiples of the initial value versus measurement time points. d, day; mo, month; S-Crea, serum creatinine; S-Cys C, serum cystatin C; eGFR, glomerular filtration rate according to the CKD-EPIcys-creaeGFR formula; DN, donor nephrectomy.