1. Department of Ophthalmology, Leiden University Medical Center, Leiden, the Netherlands
2. Department of Ophthalmology, Academic Medical Center, Amsterdam, the Netherlands
3. Bartiméus, Diagnostic Center for Complex Visual Disorders, Zeist, the Netherlands
4. Department of Ophthalmology, Ghent University and Ghent University Hospital, Ghent, Belgium
5. Center for Medical Genetics, Ghent University and Ghent University Hospital, Ghent, Belgium
6. Department of Clinical Genetics, Academic Medical Center, Amsterdam, the Netherlands
7. Ophthalmic Genetics & Visual Electrophysiology, Division of Ophthalmology, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
8. The Netherlands Institute for Neuroscience (NIN-KNAW), Amsterdam, the Netherlands