1. Center for Medical Genetics; Ghent University and Ghent University Hospital; Ghent Belgium
2. Department of Ophthalmology; Ghent University Hospital; Ghent Belgium
3. Molecular Genetics Laboratory; Institute for Ophthalmic Research; Centre for Ophthalmology; University of Tuebingen; Tuebingen Germany
4. Department of Ophthalmology; Queen Fabiola Children's University Hospital; Brussels Belgium
5. Centre de génétique humaine; Institut de Pathologie et de Génétique; Gosselies Belgium
6. Center for Human Genetics; Leuven University Hospitals; Leuven Belgium
7. Center for Medical Genetics; Free University of Brussels; Brussels Belgium
8. Center for Medical Genetics; University of Antwerp and Antwerp University Hospital; Antwerp Belgium
9. Division of Ophthalmology; The Children's Hospital of Philadelphia; Philadelphia Pennsylvania