1. Technical University Dresden, Medical Faculty Carl Gustav Carus, Institute of Medical Microbiology and Hygiene, Fetscherstrasse 74, D-01307 Dresden, Germany
2. Viollier AG, Spalenring 145/147, CH-4002 Basel, Switzerland
3. Universitätsklinikum Ulm, Department of Medical Microbiology and Hygiene, Albert-Einstein-Allee 11, D-89081 Ulm, Germany