1. Department of Diagnostic and Interventional Radiology and Neuroradiology, German Armed Forces Hospital of Ulm, Oberer Eselsberg 40, D-89081 Ulm, Germany.
2. Clinic for Tooth Preservation and Periodontics, University Hospital of Ulm, Ulm, Germany.
3. Department of Oro-Maxillofacial Surgery, German Armed Forces Hospital of Ulm, Ulm, Germany.
4. Department of Radiology, University Hospital of Ulm, Ulm, Germany.