1. Oralchirurgische Praxisklinik Illertissen, Illertissen, Germany
2. Department of Ear, Nose and Throat Diseases, Head, Neck, and Plastic Facial Surgery and Communication Disorders (Hearing, Voice and Speech Disorders), Marburg University, Fulda, Germany
3. Department of Diagnostic and Interventional Radiology, Marburg University, Fulda, Germany