1. Department of Anesthesiology and Pain Medicine; Chonbuk National University; Jeonju
2. Department of Otolaryngology-Head and Neck Surgery; College of Medicine, Chonbuk National University; Jeonju
3. Research Institute of Clinical Medicine of Chonbuk National University-Biomedical Research Institute of Chonbuk National University Hospital; Jeonju
4. Department of Otorhinolaryngology-Head and Neck Surgery; Seoul National University College of Medicine and Seoul National University Hospital; Seoul Republic of Korea