1. Department of Oral and Maxillofacial Surgery University Hospital Regensburg Regensburg Germany
2. Institute of Clinical Microbiology and Hygiene University Hospital Regensburg Regensburg Germany
3. Department of Internal Medicine II University Hospital Regensburg Regensburg Germany
4. Department of Oral and Maxillofacial Surgery Center for Medical Biotechnology University Hospital Regensburg Regensburg Germany