RT Journal Article SR Electronic T1 Serratus anterior plane block for posterior rib fractures: why and when may it work? JF Regional Anesthesia & Pain Medicine JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP rapm-2020-102098 DO 10.1136/rapm-2020-102098 A1 Carlos Rodrigues Almeida YR 2020 UL http://rapm.bmj.com/content/early/2020/11/16/rapm-2020-102098.abstract AB