1. Department of Otolaryngology – Head and Neck Surgery, Cathay General Hospital, Taipei, Taiwan
2. Department of Otolaryngology – Head and Neck Surgery, Soonchunhyang University Seoul Hospital, Soonchunhyang University College of Medicine, Seoul, Republic of Korea
3. Department of Otolaryngology – Head and Neck Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea