1. Institute of Hygiene, University Hospital Muenster, Muenster, Germany
2. Department for Periodontology and Restorative Dentistry, University Hospital Muenster, Muenster, Germany
3. Division of Clinical Microbiology, Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota, USA
4. Mayo Clinic Medical Scientist Training Program, Mayo Clinic, Rochester, Minnesota, USA
5. Division of Public Health, Infectious Diseases and Occupational Medicine, Mayo Clinic, Rochester, Minnesota, USA