1. From the Departments of Ophthalmology and
2. the Grade-Reading-Center, Department of Ophthalmology, University of Bonn, Bonn, Germany; and
3. From the Departments of Ophthalmology and 4Human Genetics, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands;
4. the Institute of Human Genetics, University of Regensburg, Regensburg, Germany.