1. Division of Infectious Diseases and Geographic Medicine, Department of Medicine, Stanford University, Stanford, CA 94304
2. Unité de Formation et de Recherche Biosciences, Université Félix Houphouët-Boigny, Abidjan, Côte d’Ivoire
3. Centre Suisse de Recherches Scientifiques en Côte d’Ivoire, Abidjan, Côte d’Ivoire
4. Swiss Tropical and Public Health Institute, Basel, Allschwil 4123 Switzerland
5. University of Basel, Basel 4001, Switzerland
6. Department of Medicine, University of Toronto, Toronto, ON M5S 1A8, Canada