1. Department of Ophthalmology State University of New York at Stony Brook, Stony Brook, New York, United States
2. Hyman-Newman Institute for Neurosurgery, Roosevelt Hospital, New York, New York, United States; and the New York Eye and Ear Infirmary, New York, New York, United States
3. Department of Ophthalmology, Flaum Eye Institute, University of Rochester School of Medicine & Dentistry, Rochester, New York, United States
4. Department of Electrical and Computer Engineering, University of Iowa, Iowa City, Iowa, United States; and Iowa City VA Health Care System, Iowa City, Iowa, United States