1. Institute of Medical Microbiology and Hygiene, University of Tübingen, Tübingen, Germany
2. Synlab Medical Care Service, Medical Care Centre Weiden, Weiden, Germany
3. Department of Microbiology and Hygiene, University Hospital Freiburg, Freiburg, Germany
4. Institute of Medical Microbiology and Hygiene, University of Mainz, Mainz, Germany
5. Anaerobe Reference Laboratory, University Hospital of Wales, Cardiff, United Kingdom