1. Program in International and Community Nutrition and Department of Nutrition, University of California, Davis, CA 95616
2. Graduate Group in Epidemiology, University of California, Davis, CA 95616
3. International Centre for Diarrhoeal Disease Research, Dhaka 1000, Bangladesh
4. HarvestPlus/International Food Policy Research Institute, Washington, DC 20006
5. International Agricultural Development Graduate Group, University of California, Davis, CA 95616