1. Department of Otolaryngology–Head and Neck Surgery, Seoul Saint Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
2. Department of Surgery, College of Medicine, Taif University, Taif, Saudi Arabia.
3. Department of Otolaryngology–Head and Neck Surgery, Bucheon Saint Mary's Hospital, College of Medicine, The Catholic University of Korea, 327 Sosa-ro, Bucheon-si, Gyeonggi-do 14647, Korea.