1. From the Dana Center for Preventive Ophthalmology, Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland; the
2. London School of Hygiene and Tropical Medicine, London, United Kingdom; the3Kilimanjaro Christian Medical College, Tumaini University, Moshi, Tanzania; the4Huruma Hospital, Rombo, Tanzania;
3. The Carter Center, Atlanta, Georgia; and the
4. Medical Research Council Laboratories, Banjul, The Gambia.
5. London School of Hygiene and Tropical Medicine, London, United Kingdom; the