[1] Univ Cologne, Dept Internal Med 2, Cologne, Germany
[2] Univ Cologne, Ctr Mol Med Cologne, Fac Med, Cologne, Germany
[3] Univ Cologne, Univ Hosp Cologne, Cologne, Germany
[4] Tech Univ Munich, Dept Nephrol, Klinikum Rechts Isar, Fac Med, Munich, Germany
[5] St Vincenz Hosp Paderborn, Med Clin 3, Nephrol & Dialysis, Paderborn, Germany
[6] Univ Witten Herdecke, Med Ctr Cologne Merheim, Dept Med 1, Nephrol Transplantat & Med Intens Care, Cologne, Germany
[7] Univ Duisburg Essen, Univ Hosp Essen, Dept Nephrol, Essen, Germany
[8] Univ Cologne, Univ Hosp Cologne, Dept Gen Visceral Canc & Transplant Surg, Fac Med, Cologne, Germany
[9] Univ Cologne, Inst Virol, Fac Med, Cologne, Germany
[10] Univ Cologne, Univ Hosp Cologne, Cologne, Germany
[11] Cologne Gen Hosp, Inst Clin Transfus Med, Transplant Ctr Cologne, Merheim Med Ctr, Cologne, Germany