RT Journal Article SR Electronic T1 ASRA 44th Annual Regional Anesthesiology and Acute Pain Medicine Meeting JF Regional Anesthesia & Pain Medicine JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP 821 OP 836 DO 10.1136/rapm-2019-ASRASpringabs VO 44 IS 8 YR 2019 UL http://rapm.bmj.com/content/44/8/821.abstract AB