1. Department of Anesthesiology and Pain Medicine, Chonnam National University Hospital, Gwangju 61469, Republic of Korea
2. Department of Anesthesiology and Pain Medicine, Chonnam National University Medical School, Hwasun 58128, Republic of Korea
3. Department of Anesthesiology and Pain Medicine, Chonnam National University Hwasun Hospital, Hwasun 58128, Republic of Korea
4. Department of Anesthesiology and Pain Medicine, School of Dentistry, Chonnam National University, Gwangju 61186, Republic of Korea