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