1Department of Otolaryngology, Kangwon National University School of Medicine, Chuncheon, Korea
2Department of Otorhinolaryngology, Catholic Kwandong University, International St. Mary’s Hospital, Incheon, Korea
3Department of Neurology, Eulji General Hospital, Seoul, Korea
4Department of Neurology, Keimyung University School of Medicine, Daegu, Korea
5Department of Neurology, St. Vincent Hospital, Catholic University of Korea, Suwon, Korea
6Department of Otorhinolaryngology, Yonsei Severance Hospital, Seoul, Korea
7Soree Ear Clinic, Seoul, Korea
8Department of Neurology, Soonchunhyang University Bucheon Hospital, Bucheon, Korea
9Department of Otolaryngology-Head and Neck Surgery, College of Medicine, The Catholic University of Korea, Seoul, Korea
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