1. Department of Periodontology, Faculty of Odontology University of Malmö Malmö Sweden
2. Division of Oral Surgery University Clinic of Dentistry, Medical University of Vienna Vienna Austria
3. Comprehensive Center Unit University Clinic of Dentistry, Medical University of Vienna Vienna Austria
4. Department of Radiation Oncology Medical University of Vienna Vienna Austria
5. Department of Maxillofacial Surgery Medical University of Vienna Vienna Austria
6. Division of Conservative Dentistry and Periodontology University Clinic of Dentistry, Medical University of Vienna Vienna Austria