1. From the Schepens Eye Research Institute, the 2Department of Ophthalmology, and
2. the Department of Ophthalmology, and the 3Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, Massachusetts; and
3. From the Schepens Eye Research Institute, the 2Department of Ophthalmology, and 4Ophthalmic Consultants of Boston, Boston, Massachusetts.