1. Institute of Tropical Medicine, Antwerp, Belgium,
2. Department of Tropical Medicine, University Hospital Antwerp, Edegem, Belgium,
3. Department of Clinical Microbiology, University Hospital, KU Leuven, Leuven, Belgium,
4. Department of Internal Medicine, University Hospital, KU Leuven, Leuven, Belgium,
5. Department of Haematology, University Hospital Antwerp, Edegem, Belgium