1. Department of Oral and Cranio-Maxillofacial Surgery, University of Heidelberg, Im Neuenheimer Feld 400, 69120 Heidelberg, Germany
2. Department of Oral and Cranio-Maxillofacial Surgery, Saarland University Medical Center, Kirrberger Straße, 66424 Homburg, Germany
3. Institute of Medical Biometry, University of Heidelberg, Im Neuenheimer Feld 130.3, 69120 Heidelberg, Germany