RT Journal Article SR Electronic T1 Fentanyl Citrate Versus Fentanyl Citrate and Morphine Sulfate in Intrathecal Narcotic Analgesia for Labor JF Regional Anesthesia: The Journal of Neural Blockade in Obstetrics, Surgery, & Pain Control JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP 53 OP 53 DO 10.1136/rapm-00115550-199722021-00053 VO 22 IS Suppl 2 A1 Kim A. Porterfield A1 Scott J. Chandler A1 Guillermo Gonzalez A1 Jeffrey W. Younger YR 1997 UL http://rapm.bmj.com/content/22/Suppl_2/53.abstract AB