RT Journal Article SR Electronic T1 Pectoral block versus paravertebral block JF Regional Anesthesia & Pain Medicine JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP rapm-2021-102662 DO 10.1136/rapm-2021-102662 A1 Zhaosheng Jin A1 Thomas Durrands A1 Ru Li A1 Tong Joo Gan A1 Jun Lin YR 2021 UL http://rapm.bmj.com/content/early/2021/04/01/rapm-2021-102662.abstract AB