1. Department of Oral, Maxillofacial and Plastic Surgery, University Hospital Bonn, 53111 Bonn, Germany
2. Department of Gynecology and Gynecological Oncology, University Hospital Bonn, 53127 Bonn, Germany
3. Department of Orthodontics, University Hospital Bonn, 53111 Bonn, Germany
4. Department of Periodontology, School of Dental Medicine, University of Bern, 3010 Bern, Switzerland
5. Department of Periodontology and Operative Dentistry, University Medical Center of the Johannes Gutenberg University, 55131 Mainz, Germany
6. Section of Experimental Dento-Maxillo-Facial Medicine, University Hospital Bonn, 53111 Bonn, Germany