1. Schön Klinik Hamburg Eilbek Hamburg Germany
2. Meyer Children's Hospital, University of Florence Florence Italy
3. Moorfields Eye Hospital and Great Ormond Street Hospital, NHS Foundation Trust London UK
4. Moorfields Eye Hospital, NHS Foundation Trust London UK
5. Hospital Sant Joan de Déu, Universitat de Barcelona Barcelona Spain
6. University Medical Center Utrecht Utrecht The Netherlands
7. Barraquer Eye Hospital Dubai United Arab Emirates
8. Great Ormond Street Hospital, NHS Foundation Trust London UK
9. Cincinnati Children's Hospital Medical Center and University of Cincinnati Cincinnati Ohio
10. St. Franziskus Hospital, Muenster, and University of Duisburg‐Essen Essen Germany
11. San Raffaele Scientific Institute Milan Italy
12. Rigshospitalet Copenhagen Denmark
13. Kantonsspital Winterthur Winterthur Switzerland
14. Universitätsklinikum Hamburg‐Eppendorf Augenklinik Hamburg Germany
15. University of California, Los Angeles, University of Washington, Seattle, and University of Florence Florence Italy