1. Medical School, University Hospital Ulm, Albert-Einstein-Allee 23, 89081 Ulm, Germany
2. Department of Oral and Plastic Maxillofacial Surgery, Marienhospital, Böheimstraße 37, 70199 Stuttgart, Germany
3. Department of Oral and Plastic Maxillofacial Surgery, Military Hospital Ulm, Academic Hospital of the University of Ulm, Oberer Eselsberg 40, 89081 Ulm, Germany
4. Department of Oral and Maxillofacial Surgery, University Hospital Ulm, Albert-Einstein-Allee 10, 89081 Ulm, Germany