1. Great Ormond Street Hospital for Children NHS Foundation Trust, London, UK
2. ‘A & P Kyriakou’, Children's Hospital, Athens, Greece
3. Clinica Pediatrica De Marchi, Milan, Italy
4. Ankara University Hospital, Ankara, Turkey
5. Hospital Cruces, Barakaldo, Vizcaya, Spain
6. Gazi University Hospital, Ankara, Turkey
7. Hopital de Hautepierre, Strasbourg, France
8. KfH Pediatric Kidney Center, Marburg, Germany
9. Gdansk University Medical School, Gdansk, Poland
10. University of Helsinki, Helsinki, Finland
11. Vilnius University, Vilnius, Lithuania
12. University Hospital Motol, Prague, Czech Republic
13. UZ Gent, Gent, Belgium
14. Center for Pediatric & Adolescent Medicine, Heidelberg, Germany
15. Nottingham University Hospitals NHS Trust, Nottingham, UK