1. Charitá - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Berlin, Berlin Institute of Health
2. Institute for Biochemistry, Berlin, Germany
3. Department of Oral and Maxillofacial Surgery, Berlin, Germany
4. Department of Periodontology and Synoptic Dentistry, Berlin, Germany
5. Department of Periodontics, University of Washington, Seattle, WA, USA