Soo Hee Lee1, Ju-Tae Sohn2,3. 1. Department of Anesthesiology and Pain Medicine, Gyeongsang National University Hospital, Jinju-si, Republic of Korea. 2. Department of Anesthesiology and Pain Medicine, Gyeongsang National University College of Medicine, Gyeongsang National University Hospital, Jinju-si, Gyeongsangnam-do, Republic of Korea. 3. Institute of Health Sciences, Gyeonsang National University, Jinju-si, Republic of Korea.