1. Department of Periodontology, Operative and Preventive Dentistry Center for Dental and Oral Medicine University Hospital Bonn Bonn Germany
2. Rheinische Friedrich‐Wilhelms‐Universität Bonn
3. Center for Oral & Dental Microbiology Service Laboratory Kiel Germany
4. Institute for Medical Biometry, Informatics and Epidemiology University of Bonn Bonn Germany
5. Division of Microbiology Paul‐Ehrlich‐Institut Langen Germany
6. Institute of Medical Microbiology, Immunology and Parasitology University of Bonn Bonn Germany