1. Department of Oral and Maxillofacial Surgery, Plastic Surgery; University Medical Centre of the Johannes Gutenberg-University; Mainz Germany
2. Department of Mathematics and Technology; University of Applied Sciences Koblenz, RheinAhrCampus Remagen; Remagen Germany
3. Institute of Medical Biometry, Epidemiology, and Informatics; Johannes Gutenberg-University; Mainz Germany
4. Department of Oral and Maxillofacial Surgery, Plastic Surgery; University of Rostock; Rostock Germany