1. Department of Clinical Research, London School of Hygiene and Tropical Medicine, London, UK
2. Cochrane Eyes and Vision, Centre for Public Health, Queen’s University Belfast, Belfast, UK
3. Department of Maternal, Newborn, Child and Adolescent Health (MCA), World Health Organization, Geneva, Switzerland
4. Department of Noncommunicable Diseases, Eye and Vision Care, World Health Organization, Geneva, Switzerland