1. Department of Control of Neglected Tropical Diseases, World Health Organization, Avenue Appia 20, 1211 Geneva 27, Switzerland.
2. World Health Organization Regional Office for Africa, Brazzaville, Congo.
3. Wilmer Eye Institute, Johns Hopkins University, Baltimore, United States of America.
4. Melbourne School of Population and Global Health, University of Melbourne, Melbourne, Australia.
5. Eye Department, Ministry of Health and Medical Services, South Tarawa, Kiribati.
6. International Centre for Eye Health, London School of Hygiene & Tropical Medicine, London, England.