1. Department of Medical Microbiology, University of Groningen, University Medical Center Groningen, Hanzeplein 1, Groningen, the Netherlands
2. Department of Molecular Genetics, Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, AG Groningen, the Netherlands
3. Institute for Microbiology, Ernst-Moritz-Arndt Universität Greifswald, Friedrich-Ludwig-Jahn-Str. 15, Greifswald, Germany
4. Department of Dermatology, University of Groningen, University Medical Center Groningen, Hanzeplein 1, RB Groningen, the Netherlands