1. Academic Medical Center, Amsterdam, The Netherlands;
2. Skåne University Hospital, Malmö, Sweden;
3. Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands;
4. San Bortolo Hospital, Vicenza, Italy;
5. Erasmus University Medical Center, Rotterdam, The Netherlands;
6. Catharina Hospital, Eindhoven, The Netherlands;
7. JW Goethe University Hospital, Frankfurt, Germany;
8. Maastricht University Medical Centre, Maastricht, The Netherlands;
9. Royal London Hospital, Barts and The London School of Medicine and Dentistry, London, United Kingdom;
10. Manchester Royal Infirmary, Manchester, United Kingdom;
11. University Hospital la Fe, Valencia, Spain;
12. Saint-Luc University Hospital, Brussels, Belgium;
13. Karolinska University Hospital, Stockholm, Sweden;
14. University Hospital La Paz and Autonoma University, Madrid, Spain;
15. Alderhey Children's Hospital, Liverpool, United Kingdom;
16. Vivantes Klinikum im Friedrichshain, Berlin, Germany;
17. Great Ormond Street National Health Service Trust, London, United Kingdom;
18. Children’s Hospital, Helsinki University Central Hospital, Helsinki, Finland;
19. Medical University of Vienna, Vienna, Austria;
20. University Medical Center Utrecht, Utrecht, The Netherlands;
21. Sapienza University of Rome, Rome, Italy;
22. Royal Adelaide Hospital, Adelaide, Australia;
23. University Medical Center Groningen, Groningen, The Netherlands;
24. Guy’s and St. Thomas’ National Health Service Foundation Trust, London, United Kingdom;
25. Azienda University Hospital Careggi, Florence, Italy;
26. Maxima Medical Center, Eindhoven/Veldhoven, The Netherlands;
27. University Clinic of Bonn, Bonn, Germany;
28. University of Leuven, Leuven, Belgium;
29. Aghia Sofia Children's Hospital, Athens, Greece;
30. Ospedale Maggiore Policlinico, Fondazione Istituto Di Ricovero e Cura a Carattere Scientifico Ca’ Granda, Milan, Italy;
31. San Giovanni Battista “Molinette” Hospital, Turin, Italy;
32. Leiden University Hospital, Leiden, The Netherlands;
33. Raphaelsklinik, Munster, Germany;
34. University Hospital of Parma, Parma, Italy;
35. Royal Free Hospital, London, United Kingdom; and
36. Sanquin Research, Leiden, The Netherlands