1. From the Department of Molecular Genetics, Institute of Ophthalmology, University College London, London, United Kingdom;2Department of Ophthalmology, Schepens Eye Research Institute, Harvard Medical School, Boston, Massachusetts; and
2. Department of Ophthalmology, Schepens Eye Research Institute, Harvard Medical School, Boston, Massachusetts; and
3. From the Department of Molecular Genetics, Institute of Ophthalmology, University College London, London, United Kingdom;
4. Moorfields Eye Hospital, London, United Kingdom.