1. Institute for Medical Informatics, Biometry and Epidemiology; Essen-Duisburg University; Essen Germany
2. Pediatric Renal Center; WKZ/UMC; Utrecht The Netherlands
3. Pediatric Renal Center; EKZ/AMC; Amsterdam The Netherlands
4. Department of Pediatrics; University Hospital Essen; Essen Germany
5. Department of Urology; University Medical Center Groningen; Groningen The Netherlands
6. Pediatric Uronephrologic Center; Queen Silvia Children's Hospital, Sahlgrenska Academy at Gothenburg University; Gothenburg Sweden
7. Department of Pediatrics; Zentralkrankenhaus Links der Weser; Bremen Germany
8. Pediatric Uronephrology Center; Ghent University Hospital; Ghent Belgium
9. Department of Pediatric Nephrology; Klinik für Kinder und Jugendliche; Jena Germany
10. Department of Pediatric Nephrology; Queen Paola Children's Hospital; Antwerp Belgium