1. F. I. Proctor Foundation, University of California, San Francisco2Department of Epidemiology and Biostatistics, University of California, San Francisco
2. Aravind Eye Care System, Madurai, India
3. Aravind Eye Care System, Coimbatore, India
4. Aravind Eye Care System, Tirunelveli, India
5. Department of Epidemiology and Biostatistics, University of California, San Francisco
6. F. I. Proctor Foundation, University of California, San Francisco
7. Department of Surgery (Ophthalmology), Dartmouth Medical School, Lebanon, New Hampshire7Department of Microbiology and Immunology, Dartmouth Medical School, Lebanon, New Hampshire
8. F. I. Proctor Foundation, University of California, San Francisco8Department of Ophthalmology, University of California, San Francisco
9. F. I. Proctor Foundation, University of California, San Francisco2Department of Epidemiology and Biostatistics, University of California, San Francisco8Department of Ophthalmology, University of California, San Francisco