1. Department of Otolaryngology, Head and Neck Surgery, Central Hospital, Pyeongchang, Korea;
2. Department of Otolaryngology, Head and Neck Surgery, Ruhr Universität Bochum, Klinikum Bielefeld, Bielefeld, Germany;
3. Department of Otolaryngology, Head and Neck Surgery, Unfallkrankenhaus Berlin, Berlin, Germany;
4. Department of Radiology, Unfallkrankenhaus Berlin, Berlin, Germany;
5. Department of Radiology, Klinikum Bielefeld, Bielefeld, Germany