1. Department of Neurology, Massachusetts General Hospital, Boston, Massachusetts, USA
2. Department of Pediatrics, Boston Medical Center, Boston, Massachusetts, USA
3. Ophthalmology, Boston Children’s Hospital, Boston, Massachusetts, USA
4. Neurology, Boston Children’s Hospital, Boston, Massachusetts, USA
5. Metabolism, Boston Children’s Hospital, Boston, Massachusetts, USA
6. Children's Hospital/Harvard Medical School, Enders 5 - The Children's Hospital, Boston, Massachusetts, USA
7. Department of ophthalmology, Howard Hughes Medical Institute - Carnegie Institution of Washington, Baltimore, Massachusetts, USA