1. Program in International and Community Nutrition, and Department of Nutrition, University of California, Davis, CA 95616
2. Helen Keller International, Africa Regional Office, BP 29 898, Dakar-Yoff, Senegal
3. Laboratoire de Nutrition, Département de Biologie Animale, Faculté des Sciences et Techniques, Université Cheikh Anta Diop de Dakar, BP 5005 Dakar-Fann, Dakar, Senegal