1. Brigham and Women’s Hospital, Harvard Medical School, Boston, MA 02115, USA
2. West African Health Organization, Bobo-Dioulasso 01 BP 153, Burkina Faso
3. GFA Consulting Group, 22359 Hamburg, Germany
4. Ecole de Santé Publique, Université Libre de Bruxelles, 1050 Brussels, Belgium
5. Institut Pasteur de Dakar, Dakar 220, Senegal
6. Department de Santé Public, Faculté de Médecine, de Pharmacie et D’Odontostomatologie, Université Cheikh Anta Diop, Dakar 5005, Senegal
7. World Health Organization Regional Office for Africa, Brazzaville P.O. Box 06, Congo
8. Centre Muraz, Institut National de Santé Publique, Bobo-Dioulasso 01 BP 390, Burkina Faso
9. Fondation Mérieux, 69002 Lyon, France