1. Department of Anesthesiology and Pain Medicine, Institute of Health Sciences, Gyeongsang National University School of Medicine, Gyeongsang National University Hospital, Jinju, Korea.
2. Department of Anesthesiology and Pain Medicine, Yeil Otorhinolaryngology Clinic, Changwon, Korea.
3. Department of Otorhinolaryngology, Yeil Otorhinolaryngology Clinic, Changwon, Korea.
4. Department of Anesthesiology and Pain Medicine, Gyeongsang National University Hospital, Jinju, Korea.