1. Lions Aravind Institute of Community Ophthalmology, Aravind Eye Care System, Madurai, India
2. Centre for Community Medicine, All India Institute of Medical Sciences, New Delhi, India
3. Aravind Eye Care System, Madurai, India
4. Dr. Rajendra Prasad Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi, India
5. Aravind Eye Hospital-Pondicherry, Pondicherry, India
6. Dipartimento di Scienze Otorino-Odonto-Oftalmologiche e Cervico Facciali, Universita` degli Studi di Parma, Parma, Italy
7. Centre for Vision and Vascular Science, School of Medicine, Dentistry and Biomedical Sciences, Queen’s University Belfast, Belfast, United Kingdom
8. Faculty of Epidemiology and Population Health, London School of Hygiene & Tropical Medicine, London, United Kingdom