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