RT Journal Article SR Electronic T1 Reply to Dr de Cassai et al JF Regional Anesthesia & Pain Medicine JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP 557 OP 557 DO 10.1097/AAP.0000000000000809 VO 43 IS 5 A1 Sanders, Rebecca A. A1 Bendel, Markus A. A1 Moeschler, Susan M. A1 Mauck, William D. YR 2018 UL http://rapm.bmj.com/content/43/5/557.2.abstract AB