1. Bundeswehr Military Medical Department Wilhelmshaven, Wilhelmshaven, Germany
2. Infectious Disease Epidemiology, Bernhard Nocht Institute for Tropical Medicine Hamburg, Hamburg, Germany
3. Department of Microbiology and Hospital Hygiene, Bundeswehr Hospital Hamburg, Hamburg, Germany
4. Institute for Medical Microbiology, Virology and Hygiene, University Medicine Rostock, Rostock, Germany