RT Journal Article SR Electronic T1 Postoperative Epidural Analgesia with Ropivacaine 0.2% Versus 0.3% after Major Orthopedic Surgery: Pharmacokinetic Evaluation JF Regional Anesthesia: The Journal of Neural Blockade in Obstetrics, Surgery, & Pain Control JO Reg Anesth Pain Med FD BMJ Publishing Group Ltd SP 79 OP 79 DO 10.1136/rapm-00115550-199722021-00079 VO 22 IS Suppl 2 A1 Anton G.L. Burm A1 Jack W. van Kleef A1 Rolf P. Brouwer A1 Rudolf Stienstra A1 Britt-Marie Emanuelsson YR 1997 UL http://rapm.bmj.com/content/22/Suppl_2/79.abstract AB