1. Epicentre, 8 rue Saint-Sabin, 75011 Paris, France.
2. Agence de Médecine Préventive, Paris, France.
3. Directorate of Preventive Health Services, Ministry of Health, Lilongwe, Malawi.
4. Department of Infectious Hazard Management, World Health Organization, Geneva, Switzerland.
5. Médecins Sans Frontières, Paris, France.