RT Journal Article SR Electronic T1 Continuous Epidural Infusion of Ropivacaine-Fentanyl Epinephrine for Labor Pain: What is the optimal concentration of ropivacaine? JF Regional Anesthesia & Pain Medicine JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP 37 OP 37 DO 10.1136/rapm-00115550-199924031-00037 VO 24 IS Suppl 1 A1 Shaul Cohen A1 B. Hronkova A1 M. Croitoru A1 E. Burley A1 J. Buglisi, Jr. A1 G.J. Grant YR 1999 UL http://rapm.bmj.com/content/24/Suppl_1/37.abstract AB