1. Department of Oral and Maxillofacial Surgery; University of Marburg; University Hospital Giessen and Marburg; Campus Marburg; Marburg Germany
2. Department of Oral-Maxillofacial and Plastic Surgery; University of Rostock; Rostock Germany
3. Department of Otorhinolaryngology; University of Marburg; University Hospital Giessen and Marburg; Campus Marburg; Marburg Germany
4. Department of Operative Dentistry and Endodontology; University of Marburg; Marburg Germany