1. Department of Pediatrics, Antwerp University Hospital, Antwerp, Belgium
2. Institute for Medical Informatics, Biometry and Epidemiology, University Hospital Essen, Essen, Germany
3. Pediatric Renal Center, Queen Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht
4. Pediatric Uronephrology Center, Ghent University Hospital, Ghent, Belgium
5. Department of Urology, University Medical Center Groningen, Groningen, The Netherlands
6. Department of Physiology, Queen Silvia Children's Hospital, Sahlgrenska Academy at Gothenburg University, Gothenburg, Sweden