1. Children & Young People's Kidney Unit, Nottingham City Hospital, Nottingham, United Kingdom
2. Clinica Pediatrica C and D de Marchi, University of Milan, Italy;
3. Hôpital de Hautepierre, Strasbourg, France;
4. University of Marburg, Marburg, Germany;
5. University of Helsinki, Helsinki, Finland;
6. Wilhelmina Kinderziekenhuis, Utrecht, The Netherlands;
7. University Hospital Motol, Prague, Czech Republic;
8. A&P Kyriakou Children's Hospital, Athens, Greece;
9. Medical University of Gdansk, Gdansk, Poland;
10. University Hospital, Ghent, Belgium;
11. University Hospital, Heidelberg, Germany
12. Hospital Infantil La Paz, Madrid, Spain;
13. University Hospital, Riga, Latvia.