1. Department of Tropical Medicine at the Bernhard Nocht Institute; German Armed Forces Hospital of Hamburg; Hamburg Germany
2. Institute for Microbiology, Virology and Hygiene; University Hospital Rostock; Rostock Germany
3. Institute for Medical Microbiology and Hygiene; University Hospital Ulm; Ulm Germany
4. Institute for Medical Microbiology; Justus Liebig University Giessen; Giessen Germany
5. Bernhard Nocht Institute for Tropical Medicine; Hamburg Germany