1. David Geffen School of Medicine, University of California, Los Angeles
2. Department of Ophthalmology, Stein and Doheny Eye Institutes, University of California, Los Angeles
3. Sacramento Eye Consultants, Sacramento, California
4. Department of Biostatistics, Fielding School of Public Health, University of California, Los Angeles
5. Department of Ophthalmology, Wayne State University School of Medicine, Detroit, Michigan
6. Department of Epidemiology, Fielding School of Public Health, University of California, Los Angeles