1. 1Department for Tropical Medicine, Bernhard-Nocht-Institute for Tropical Medicine & I. Department of Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany;
2. 2Centre de Recherches Médicales de Lambaréné, Gabon;
3. 3German Center for Infection Research (DZIF), Partner Site Hamburg-Lübeck-Borstel-Riems, Germany