1. Department for Infectious Disease Epidemiology, HIV/AIDS, STI and Bloodborne Infections Unit, Robert Koch Institute, Berlin, Germany
2. Department of Medical Microbiology, Virology and Hygiene, Universitätsklinikum Hamburg-Eppendorf, Hamburg, Germany
3. Department of Epidemiology and Health Reporting, Central Epidemiological Laboratory Unit, Robert Koch Institute, Berlin, Germany