RT Journal Article SR Electronic T1 APENG vis-à-vis PENG JF Regional Anesthesia & Pain Medicine JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP rapm-2019-101149 DO 10.1136/rapm-2019-101149 A1 Gurkaran kaur Sidhu A1 Kavin Khatri A1 Seema Jindal YR 2019 UL http://rapm.bmj.com/content/early/2019/12/24/rapm-2019-101149.abstract AB