RT Journal Article SR Electronic T1 A five way comparison of extradural ropivacaine and bupivacaine JF Regional Anesthesia: The Journal of Neural Blockade in Obstetrics, Surgery, & Pain Control JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP 20 OP 20 DO 10.1136/rapm-00115550-199015011-00020 VO 15 IS Suppl 1 A1 Brockway, Michael A1 Bannister, John A1 McKeown, Dermot A1 Wildsmith, John YR 1990 UL http://rapm.bmj.com/content/15/Suppl_1/20.abstract AB