1. Department of Medical Genetics; King Faisal Specialist Hospital and Research Centre; Riyadh Saudi Arabia
2. Department of Pediatrics; Faculty of Medicine; Ain Shams University; Cairo Egypt
3. Department of Genetics; King Faisal Specialist Hospital and Research Centre; Riyadh Saudi Arabia
4. Section of Ophthalmology; King Faisal Specialist Hospital and Research Centre; Riyadh Saudi Arabia
5. Department of Pediatrics; King Fahad Medical City; Riyadh Saudi Arabia
6. Department of Otolaryngology/Head and Neck Surgery and Communication Sciences; King Faisal Specialist Hospital and Research Centre; Riyadh Saudi Arabia
7. Department of Pediatrics; King Faisal Specialist Hospital and Research Centre; Riyadh Saudi Arabia
8. College of Medicine; Alfaisal University; Riyadh Saudi Arabia