1. Lions Aravind Institute of Community Ophthalmology; Aravind Eye Care System; Madurai India
2. Aravind Eye Hospital; Pondicherry India
3. Aravind Eye Care System; Madurai India
4. Sezione di Oftalmologia; Dipartimento di Scienze Otorino-Odonto-Oftalmologiche e Cervico Facciali; Università degli Studi di Parma; Parma Italy
5. Dipartimento di Scienze Biomediche, Biotecnologiche e Traslazionali-S.Bi.Bi.T; Università degli Studi di Parma; Parma Italy
6. Centre for Vision & Vascular Science; School of Medicine, Dentistry and Biomedical Sciences; Queen's University Belfast; Belfast UK
7. Department of Health Services, Research and Policy; London School of Hygiene & Tropical Medicine; London UK
8. Faculty of Epidemiology & Population Health; London School of Hygiene & Tropical Medicine; London UK