RT Journal Article SR Electronic T1 Postoperative Pain Management in Opioid-Tolerant Patients JF Regional Anesthesia: The Journal of Neural Blockade in Obstetrics, Surgery, & Pain Control JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP 114 OP 116 DO 10.1136/rapm-00115550-199621061-00025 VO 21 IS Suppl 6 A1 Oscar A. de Leon-Casasola YR 1996 UL http://rapm.bmj.com/content/21/Suppl_6/114.abstract AB