RT Journal Article SR Electronic T1 Continuous Postoperative Epidural Infusions: a clinical study comparing variable concentrations of hydromorphone/bupivicaine and fentanyl/bupivicaine JF Regional Anesthesia: The Journal of Neural Blockade in Obstetrics, Surgery, & Pain Control JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP 73 OP 73 DO 10.1136/rapm-00115550-199318021-00073 VO 18 IS Suppl 2 A1 Miller, Nathan A. A1 Lee, Victor C. A1 Eksterowicz, Nancy R. A1 Rowlingson, John C. YR 1993 UL http://rapm.bmj.com/content/18/Suppl_2/73.abstract AB