Pei-Hsun Liao1, Yu-Hsuan Lin2, Ting-Shou Chang3. 1. Resident, Department of Otolaryngology, Head and Neck Surgery, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan. 2. Chief Resident, Department of Otolaryngology, Head and Neck Surgery, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan. 3. Attending Physician, Department of Otolaryngology, Head and Neck Surgery, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan.