1. Ophthalmic Consultants of Boston, Boston, Massachusetts
2. New England Eye Center, Tufts Medical Center, Boston, Massachusetts
3. Pediatric Ophthalmology Service, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts
4. Department of Ophthalmology, College of Medicine, King Saud University, Riyadh, Saudi Arabia
5. Wills Eye Hospital, Mid Atlantic Retina, Thomas Jefferson University, Philadelphia, Pennsylvania