1. Department of Ophthalmology; Radboud University Medical Center; Nijmegen The Netherlands
2. Department of Human Genetics; Radboud University Medical Center; Nijmegen The Netherlands
3. Institute of Child Health and Metabolism Unit; Department of Pediatrics; Hacettepe University; Ankara Turkey
4. Department of Ophthalmology; Hadassah-Hebrew University Medical Center; Jerusalem Israel
5. Electrophysiology Clinic; Goldschleger Eye Research Institute; Tel Aviv University; Sheba Medical Centre; Ramat Gan Israel
6. The Rotterdam Eye Hospital; Rotterdam The Netherlands
7. Bartiméus, Institute for the Visually Handicapped; Zeist The Netherlands
8. Nijmegen Center for Molecular Life Sciences; Radboud University Medical Center; Nijmegen The Netherlands