1. Department of Otorhinolaryngology-Head and Neck Surgery, Soonchunhyang University College of Medicine, Cheonan, Republic of Korea
2. Department of Otorhinolaryngology-Head and Neck Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
3. Department of Neurology, Yale University School of Medicine, New Haven, CT, USA
4. Department of Biomedical Engineering, Hanyang University, Seoul, Republic of Korea