RT Journal Article SR Electronic T1 Masked Mischief JF Regional Anesthesia: The Journal of Neural Blockade in Obstetrics, Surgery, & Pain Control JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP 143 OP 144 DO 10.1136/rapm-00115550-199318030-00001 VO 18 IS 3 A1 Bromage, Philip R. YR 1993 UL http://rapm.bmj.com/content/18/3/143.abstract AB