1. Centre International de Recherches Médicales de Franceville (CIRMF), Franceville, Gabon
2. Centre International de Recherches Médicales de Franceville (CIRMF), Franceville, Gabon and CDC Atlanta, Atlanta, Georgia
3. Institute of Tropical Medicine, Department of Parasitology, University of Tübingen, Wilhelmstrasse, Tübingen, Germany and Medical Research Unit, Albert Schweitzer Hospital, Lambaréné, Gabon