1. Social Science Research Council, Brooklyn, New York.
2. Independent Consultant, San Francisco, California.
3. National Institutes of Health, Bethesda, Maryland.
4. Dartmouth Medical School, Lebanon, New Hampshire.
5. Feinberg School of Medicine, Northwestern University, Evanston, Illinois.
6. Hôpital Le Dantec, University of Cheikh Anta Diop, Dakar, Senegal.