[1] Hannover Med Sch, Dept Pediat Kidney Liver & Metab Dis, Carl Neuberg Str 1, D-30625 Hannover, Germany
[2] German Soc Transit Med, Hannover, Germany
[3] Univ Heidelberg Hosp, Ctr Child & Adolescent Med, Div Pediat Nephrol, Heidelberg, Germany
[4] Hannover Med Sch, Dept Epidemiol Social Med & Hlth Syst Res, D-30625 Hannover, Germany
[5] DRK Kliniken German Red Cross Hosp Berlin, Berliner Transit Programm, Berlin, Germany
[6] Charite, Dept Pediat Nephrol, Berlin, Germany
[7] Univ Hosp Bonn, Bonn, Germany
[8] Essen Univ Hosp, Dept Pediat 2, Essen, Germany
[9] Univ Erlangen Nurnberg, Childrens Hosp, Erlangen, Germany
[10] Clementine Childrens Hosp, KfH Ctr Pediat Nephrol, Frankfurt, Germany
[11] Freiburg Univ Hosp, Dept Gen Pediat Adolescent Med & Neonatol, Freiburg, Germany
[12] Univ Childrens Hosp Eppendorf, Hamburg, Germany
[13] Univ Childrens Hosp, Jena, Germany
[14] Univ Hosp Cologne, Pediat Nephrol, Cologne, Germany
[15] Univ Childrens Hosp, Leipzig, Germany
[16] St Georg Hosp, KfH Ctr Pediat Nephrol, Leipzig, Germany
[17] Univ Hosp Marburg, KfH Ctr Pediat Nephrol, Marburg, Germany
[18] Childrens Hosp Memmingen, KfH Ctr Pediat Nephrol, Memmingen, Germany
[19] Univ Childrens Hosp Munster, Munich, Germany
[20] Univ Childrens Hosp Munchen Schwabing, KfH Ctr Pediat Nephrol, Munich, Germany
[21] Univ Munich, Dr von Haunersches Kinderspital, Munich, Germany
[22] Olgahosp Klinikum Stuttgart, Childrens Hosp, Stuttgart, Germany
[23] Univ Childrens Hosp Tubingen, Tubingen, Germany
[24] Univ Childrens Hosp, Rostock, Germany
[25] Univ Childrens Hosp, Vienna, Austria
[26] Hosp Hannover Reg, KfH Ctr Nephrol, Hannover, Germany