1. Department of Otorhinolaryngology–Head and Neck Surgery Soonchunhyang University College of Medicine Cheonan Korea
2. Department of Otolaryngology–Head and Neck Surgery, Seoul St. Mary's Hospital, College of Medicine The Catholic University of Korea Seoul Korea
3. Department of Physiology and Biomedical Engineering Mayo Clinic Rochester Minnesota USA
4. Department of Otolaryngology–Head and Neck Surgery, Bucheon St. Mary's Hospital, College of Medicine The Catholic University of Korea Seoul Korea