1. Department of Ophthalmology, Vagelos College of Physicians and Surgeons, Columbia University, New York, New York, USA.
2. Edward S. Harkness Eye Institute, Columbia University, Irving Medical Center, New York, New York, USA.
3. Department of Ophthalmology, Wilmer Eye Institute, Johns Hopkins School of Medicine, Baltimore, Maryland, USA.
4. Department of Biostatistics, Columbia University Mailman School of Public Health, New York, New York, USA.