RT Journal Article SR Electronic T1 Paravertebral Blockade for Mastectomy: The Importance of Assessing Efficacy JF Regional Anesthesia & Pain Medicine JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP 562 OP 563 DO 10.1097/AAP.0000000000000160 VO 39 IS 6 A1 Ardon, Alberto E. A1 Greengrass, Roy A. YR 2014 UL http://rapm.bmj.com/content/39/6/562.abstract AB