1 Department of Anesthesiology and Pain Medicine, Gyeongsang National University School of Medicine and Gyeongsang National University Hospital, 15 Jinju-daero 816 beon-gil, Jinju-si, Gyeongsangnam-do, 52727, Republic of Korea; Institute of Health Sciences, Gyeongsang National University, Jinju-si, 52727, Republic of Korea. Electronic address: jtsohn@gnu.ac.kr.