1. Polyclinic for Oral Surgery, Heinrich Heine University, Düsseldorf, Germany
2. Department of Restorative Dentistry & Periodontology, Dental School, Ludwig Maximilian University, Munich, Germany
3. Private Practice in Oral and Maxillofacial Surgery, MKG-Praxisklinik, Munich, Germany
4. Private Practice in Organisational Psychology and Diagnostics, University of Salzburg, Salzburg, Austria
5. Faculty of Medicine, Ruhr University, Bochum, Germany