1. Department of Internal Medicine, Weill Bugando School of Medicine, 1464 Mwanza, Tanzania
2. Institutes of Virology and Immunobiology, University of Würzburg, Würzburg, Germany
3. Medical Mission Institute, Würzburg, Germany
4. Department of Biochemistry and Molecular Biology, Weill Bugando School of Medicine, 1464 Mwanza, Tanzania
5. Department of Internal Medicine, University of Dodoma, 1935 Dodoma, Tanzania
6. Division of Infectious Diseases, Department of Internal Medicine, University of Würzburg, Würzburg, Germany