1. Hearing Research Laboratory, Samsung Medical Center, Seoul, Korea.
2. Department of Otorhinolaryngology-Head and Neck Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
3. Demant Korea Co., Ltd., Seoul, Korea.
4. Medical Research Institute, Sungkyunkwan University School of Medicine, Suwon, Korea.
5. Center for Clinical Epidemiology, Samsung Medical Center, Seoul, Korea.