1. Institute for Medical Microbiology and Epidemiology of Infectious Diseases, University of Leipzig, Liebigstr. 24, 04103 Leipzig, Germany
2. Institute of Biochemistry, Medical Faculty, University of Leipzig, Johannisallee 30, 04103 Leipzig, Germany
3. Department of Conservative Dentistry and Periodontology, University of Leipzig, Nürnberger Straße 57, 04103 Leipzig, Germany