Kwang-Jae Cho, MD PhD, Department of Otolaryngology-Head and Neck Surgery, Uijeongbu St. Mary's Hospital, The Catholic University, Uijeongbu-si, Gyeonggi-do, South Korea
Jun-Ook Park, Department of Otolaryngology-Head and Neck Surgery, Eunpyeong St. Mary's Hospital, The Catholic University, Seoul, South Korea.