1. Department of Otolaryngology Head and Neck Surgery, Inje University College of Medicine, Haeundae Paik Hospital, Busan, South Korea
2. Department of Surgery, The Catholic University of Korea, College of Medicine, Seoul St Mary’s Hospital, Seoul, South Korea
3. Department of Otorhinolaryngology-Head and Neck Surgery, The Catholic University of Korea, College of Medicine, Seoul St Mary’s Hospital, Seoul, Republic of Korea