1. Department of Epidemiology and Public Health, Yale University, 60 College Street, New Haven, CT 06520, USA.
2. Department of Ophthalmology and Visual Science, Yale University, 330 Cedar Street, New Haven, CT 06520, USA.
3. Department of Molecular, Cellular, and Developmental Biology, Yale University, 219 Prospect Street, New Haven, CT 06520, USA.
4. Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong, Hong Kong, China.
5. Genomics Resource Center, Rockefeller University, 1230 York Avenue, New York, NY 10021, USA.