1. Department of Otolaryngology—Head and Neck Surgery, Kaohsiung Medical University HospitalKaohsiung Medical University Kaohsiung Taiwan
2. Faculty of MedicineCollege of Medicine, Kaohsiung Medical University Kaohsiung Taiwan
3. Department of Otolaryngology—Head and Neck SurgeryCollege of Medicine, Kosin University Busan South Korea
4. Department of Otolaryngology—Head and Neck SurgeryCollege of Medicine, Hanyang University Seoul South Korea
5. Department of Otolaryngology–Head and Neck SurgeryJohns Hopkins University School of Medicine Baltimore Maryland
6. Department of AnesthesiologyKaohsiung Medical University Hospital, Kaohsiung Medical University Kaohsiung Taiwan