RT Journal Article SR Electronic T1 Erector spinae plane: a collapsible potential space JF Regional Anesthesia & Pain Medicine JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP rapm-2019-101107 DO 10.1136/rapm-2019-101107 A1 Lei Xu A1 Jody C Leng A1 Edward R Mariano A1 Ban C H Tsui YR 2019 UL http://rapm.bmj.com/content/early/2020/01/13/rapm-2019-101107.abstract AB