1. Médecins sans Frontières, Barcelona, SpainCurrent affiliation: Catalan Institute of Health, Barcelona, Spain.
2. Institute Pasteur of Bangui, Bangui, Central African Republic
3. Médecins sans Frontières, Barcelona, Spain
4. Ministry of Health, Bangui, Central African Republic
5. University of the West Indies, Bridgetown, Barbados
6. National Reference Centre for Enterically Transmitted Hepatitis, Val de Grâce, Paris, France