1. Department of Otorhinolaryngology–Head and Neck Surgery, Konyang University Hospital, Konyang University College of Medicine, Daejeon, Republic of Korea
2. Myunggok Medical Research Institute, College of Medicine, Konyang University, Daejeon, Republic of Korea
3. Department of Otorhinolaryngology–Head and Neck Surgery, Chuncheon Sacred Heart Hospital, Hallym University College of Medicine, Chuncheon, Republic of Korea
4. Institute of New Frontier Research, Hallym University College of Medicine, Chuncheon, Republic of Korea