| Affiliation: | 1. Birmingham and Midland Eye Centre, Sandwell and West Birmingham Hospitals NHS Trust, United Kingdom;2. National Healthcare Group Eye Institute, Tan Tock Seng Hospital, Singapore;1. Francis I. Proctor Foundation, San Francisco, California;2. Aravind Eye Care System, Madurai, Pondicherry, and Coimbatore, India;3. Department of Ophthalmology, University of California San Francisco, San Francisco, California;4. Department of Epidemiology and Biostatistics, University of California San Francisco, San Francisco, California |
