affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, Fondation Botnar, affiliation not provided to SSRN, London School of Hygiene and Tropical Medicine, Goethe University Frankfurt - University of Zurich, Universidad Peruana Cayetano Heredia - Unit for Environmental Development, Health and Environment, affiliation not provided to SSRN, Centre Suisse de Recherches Scientifiques en Côte d’Ivoire, Johns Hopkins University, Rwanda International Institute of Ophthalmology, University of Basel - Swiss Tropical and Public Health Institute, University of Cape Coast, University of Nairobi, affiliation not provided to SSRN, University of Basel - Swiss Tropical and Public Health Institute, University of Basel - Swiss Tropical and Public Health Institute, affiliation not provided to SSRN, University of Basel - Swiss Tropical and Public Health Institute, Institute for Health Policy, Aravind Eye Hospital, University of New South Wales (UNSW) - School of Optometry and Vision Science, affiliation not provided to SSRN, Lao Tropical Public Health Institute, affiliation not provided to SSRN, University of Basel, affiliation not provided to SSRN, affiliation not provided to SSRN, University of Basel - Swiss Tropical and Public Health Institute and University of Basel - Swiss Tropical and Public Health Institute

Pontificia Universidad Católica de Chile, Universidad Peruana Cayetano Heredia - Unit for Environmental Development, Health and Environment, Universidade Federal do Rio Grande do Sul (UFRGS), Universidad Peruana Cayetano Heredia, Meehan Green and Colorado State University, Fort Collins

Johns Hopkins University, Johns Hopkins University, Johns Hopkins University - Bloomberg School of Public Health, Universidad Peruana Cayetano Heredia - Unit for Environmental Development, Health and Environment, Asociación Benefica PRISMA and Johns Hopkins University - Department of International Health