[1] Med Univ GDAnSK, Gdansk, Poland
[2] Hacettepe Univ, Izmir, Turkey
[3] Med Hsch, Hannover, Germany
[4] Dr Behcet Uz Children Res & Educ Hosp, Izmir, Turkey
[5] Great Ormond St Hosp Sick Children, London WC1N 3JH, England
[6] Childrens Mem Hosp, Warsaw, Poland
[7] Istanbul Univ, Istanbul, Turkey
[8] Aristotles Univ, Thessaloniki, Greece
[9] Pediat Clin, Nephrol Unit, Skopje, Macedonia
[10] Dubai Hosp, Dubai, U Arab Emirates
[11] KFH Ctr Children & Adolescents, Hamburg, Germany
[12] Huch Hosp Children & Adolescents, Helsinki, Finland
[13] G Gaslini Inst Children, Genoa, Italy
[14] Ege Univ, Fac Med, Izmir, Turkey
[15] Univ Amsterdam, Acad Med Ctr, NL-1105 AZ Amsterdam, Netherlands
[16] Childrens Dialysis Ctr, Strasbourg, France
[17] Dip Nefrol Urol, Unit Dialisi, Rome, Italy
[18] Publ Paediat Teaching Hosp, Warsaw, Poland
[19] Dialysis & Transplant Unit, Padua, Italy
[20] Ctr Pediat & Adolescent Med, Heidelberg, Germany