1. Division of Pediatric Ophthalmology, King Khaled Eye Specialist Hospital, Riyadh, Saudi Arabia,
2. Department of Ophthalmology, College of Medicine, King Saud University, Riyadh, Saudi Arabia,
3. Division of Ophthalmology, Faculty of Health Sciences, University of Stellenbosch, Tygerberg, South Africa, and
4. Divisions of Neurology and Ophthalmology, Children’s Hospital, Boston, MA, USA