1. National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia
2. Agence de Médecine Préventive, Paris, France
3. Agence de Médecine Préventive, Ouagadougou, Burkina Faso
4. World Health Organization, Geneva, Switzerland
5. World Health Organization Regional Office for Africa, Brazzaville, Republic of the Congo