1. Department of International Health, The Johns Hopkins School of Hygiene and Public Health, Baltimore, MD 21205
2. Nepal Nutrition Intervention Project-Sarlahi (NNIPS), Nepal Netra Jyoti Sangh, Nepal Eye Hospital Complex, Tripureswor, Kathmandu, Nepal
3. Schistosomiasis and Intestinal Parasites Unit, Division of Control of Tropical Diseases, World Health Organization, Geneva 27, Switzerland