1. Division of Pediatric Neurology; Department of Pediatrics, College of Medicine, King Saud University; Riyadh; Saudi Arabia
2. Institut für Humangenetik, Universitätsklinikum Tübingen; Tübingen; Germany
3. Department of Ophthalmology; College of Medicine, King Saud University; Riyadh; Saudi Arabia
4. Department of Radiology; College of Medicine, King Saud University; Riyadh; Saudi Arabia
5. Department of Physiology; College of Medicine, King Saud University; Riyadh; Saudi Arabia
6. Department of Ropers-Molecular Human Genetics; Max-Planck Institute of Molecular Genetics; Berlin; Germany