RT Journal Article SR Electronic T1 Reply to Drs Ren and Fu JF Regional Anesthesia & Pain Medicine JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP 1012 OP 1013 DO 10.1136/rapm-2020-102428 VO 46 IS 11 A1 Park, Sun-Kyung A1 Seo, Jeong-Hwa YR 2021 UL http://rapm.bmj.com/content/46/11/1012.2.abstract AB