1. Swiss Tropical and Public Health Institute, Kreuzstr. 2, 4123 Allschwil, Switzerland;
2. University of Basel, Petersplatz 1, 4003 Basel, Switzerland;
3. University of Lausanne, 1000, Lausanne, Switzerland;
4. Centre Suisse de Recherches Scientifiques en Côte d’Ivoire, 01 BP. 1303, Abidjan, Côte d’Ivoire;
5. University of Zürich, Rämistrasse 71, 8006, Zürich, Switzerland