1. Institute of Medical Microbiology and Hygiene, Saarland University, Homburg/Saar, Germany
2. University of Basel, Basel, Switzerland
3. Department of Epidemiology and Public Health, Swiss Tropical and Public Health Institute, Basel, Switzerland
4. Department of Medical Services and Diagnostic, Swiss Tropical and Public Health Institute, Basel, Switzerland
5. Department of Medicine II, Saarland University, Homburg/Saar, Germany
6. Institute of Pathology, Saarland University, Homburg/Saar, Germany