1. Department of Otorhinolaryngology–Head and Neck Surgery, Sungkyunkwan University School of Medicine, Samsung Medical Center, Seoul, South Korea
2. Hearing Research Laboratory, Samsung Medical Center, Seoul, South Korea
3. Center for Clinical Epidemiology, Samsung Medical Center, Seoul, South Korea
4. Department of Otorhinolaryngology–Head and Neck Surgery, Sungkyunkwan University School of Medicine, Samsung Changwon Hospital, Changwon, South Korea