1. Department of Oral & Maxillofacial Surgery; Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health; Augustenburger Platz 1, Berlin 13353 Germany
2. Department of Oral & Maxillofacial Surgery; University Medical Center Hamburg-Eppendorf; Martinistraße 52, Hamburg 20246 Germany
3. Department of Medical Biometry and Epidemiology; University Medical Center Hamburg-Eppendorf; Martinistraße 52, Hamburg 20246 Germany
4. Institute of Osteology and Biomechanics; University Medical Center Hamburg-Eppendorf; Martinistraße 52, Hamburg 20246 Germany