RT Journal Article SR Electronic T1 A Comparison of Two Methods of Epidural Analgesia on Pain Relief During Labor and Delivery JF Regional Anesthesia: The Journal of Neural Blockade in Obstetrics, Surgery, & Pain Control JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP 52 OP 52 DO 10.1136/rapm-00115550-199722021-00052 VO 22 IS Suppl 2 A1 Joseph Park A1 R. Arellano A1 S. Rolbin A1 P. Morgan A1 Hwan Joo YR 1997 UL http://rapm.bmj.com/content/22/Suppl_2/52.abstract AB