RT Journal Article SR Electronic T1 The effect of adding bupivacaine to single intrathecal use of fentanyl for analgesia in the second stage of labor: 184. JF Regional Anesthesia & Pain Medicine JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP 50 OP 50 DO 10.1053/rapm-00115550-200309001-00088 VO 28 IS Suppl 1 A1 L Pirbudak YR 2003 UL http://rapm.bmj.com/content/28/Suppl_1/50.1.abstract AB