1. Department of Otolaryngology, Kangwon National University Hospital, College of Medicine, Kangwon National University, Chuncheon, Korea
2. Division of Cardiology, Department of Internal Medicine, Kangwon National University Hospital, College of Medicine, Kangwon National University, Chuncheon, Korea
3. Department of Otorhinolaryngology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Korea