Int J Med Sci 2020; 17(1):82-88. doi:10.7150/ijms.39014 Research Paper Ji Young Min1, AMi Woo1, Min Suk Chae2, Sang Hyun Hong2, Chul Soo Park2, Jong Ho Choi2, Hyun Sik Chung1 1. Department of Anesthesiology and Pain Medicine, Eunpyeong St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea. 2. Department of Anesthesiology and Pain Medicine, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea.