1. Centre de Recherche en Sante de Nouna, Nouna, Burkina Faso;
2. National Health Information System, Ministry of Health, Ouagadougou, Burkina Faso;
3. Francis I. Proctor Foundation, University of California San Francisco, San Francisco, California;
4. Africa Health Research Institute, KwaZulu-Natal, South Africa;
5. Department of Global Health and Population, Harvard T.H. Chan School of Public Health, Boston, Massachusetts;
6. Heidelberg Institute of Public Health, Heidelberg University, Heidelberg, Germany;
7. Cornea and Refractive Surgery, Massachusetts Eye and Ear Hospital, Boston, Massachusetts;
8. Department of Epidemiology and Biostatistics, University of California San Francisco, San Francisco, California
9. Department of Ophthalmology, University of California San Francisco, San Francisco, California;