[1] Univ Childrens Hosp, Dept Pediat 1, Heidelberg, Germany
[2] Hannover Med Sch, Hannover, Germany
[3] Heidelberg Univ, Inst Med Biometry & Informat, Heidelberg, Germany
[4] IRCCS Osped Pediat Bambino Gesu, Rome, Italy
[5] Hacettepe Univ, Fac Med, Dept Pediat Nephrol, TR-06100 Ankara, Turkey
[6] Univ Childrens Hosp, Dept Gen Pediat, Pediat Nephrol, Munster, Germany
[7] Olga Childrens Hosp, Clin Stuttgart, Stuttgart, Germany
[8] Cent Manchester Univ Hosp NHS Fdn Trust, Manchester Acad Hlth Sci Ctr, Royal Manchester Childrens Hosp, Manchester, Lancs, England
[9] Baskent Univ, Adana Teaching & Res Ctr, Dept Pediat Nephrol, Adana, Turkey
[10] Great Ormond St Hosp Sick Children, London, England
[11] Ankara Univ, Fac Med, TR-06100 Ankara, Turkey
[12] Univ Childrens Hosp, Hamburg, Germany
[13] Univ Childrens Hosp, Tubingen, Germany
[14] Univ Childrens Hosp, Freiburg, Germany
[15] Childrens Hosp, Memmingen, Germany
[16] Univ Heidelberg Hosp, Dept Infect Dis, Virol, Heidelberg, Germany