1. Institut de Recherche pour le Développement, UMR 177 IRD-CIRAD INTERTRYP, Campus International de Baillarguet TA A-17/G, 34398 Montpellier Cedex 5, France.
2. Department of Clinical Sciences, Institute of Tropical Medicine, Antwerp, Belgium.
3. Control of Neglected Tropical Diseases, World Health Organization, Geneva, Switzerland.