1. 1Department of Biomedical Sciences, Institute of Tropical Medicine, Antwerpen, Belgium
2. 2Department of Mathematics and Computer Science, University of Antwerp, Antwerpen, Belgium
3. 3Department of Clinical Sciences, Institute of Tropical Medicine, Antwerpen, Belgium
4. 4Department of Microbiology and Immunology, Katholieke Universiteit Leuven (KU Leuven), Leuven, Belgium
5. 5Department of Medicine, University of Cambridge, Addenbrooke's Hospital, Cambridge, UK
6. 6Wellcome Trust Sanger Institute, Hinxton, UK