Johns Hopkins University, Baltimore, Maryland, United States
Rare Disease Research, Atlanta, Georgia, United States
Childrens Hospital of Los Angeles, Los Angeles, California, United States
Universitair Ziekenhuis Gent, Gent, Belgium
C. H. U. Sart Tilman, Liege, Belgium
CHU Angers - Hôpital Hôtel Dieu, Angers, France
University Hospital of Wales, Cardiff, United Kingdom
Institut Catala de Retina, Barcelona, Spain
Hospital Universitario Ramon y Cajal, Madrid, Spain
Ospedale San Raffaele, Milano, Italy
Universitaetsklinikum Essen, Essen, Germany
CHU Amiens - Centre Saint Victor, Amiens, Somme, France
University Eye Clinic, Ljubljana, Slovenia
Fondazione G.B. Bietti, Rome, Italy
CIC/CMR CHNO des Quinze-Vingts, Paris, France
NINDS, Bethesda, Maryland, United States
Biomedical Research Centre, The Medical School, Newcastle upon Tyne, United Kingdom
Friedrich Baur Institut Neurologische Klinik und Poliklinik, München, Germany
Hôpital Notre-Dame (CHUM), Montreal,, Quebec, Canada
The National Hospital, University College London, London, United Kingdom
University of California Davis Medical Center, Sacramento, California, United States
Children's Hospital Colorado, Aurora, Colorado, United States
Carolinas Medical Center, Neurosciences and Spine Institute, Charlotte, North Carolina, United States