%0 Journal Article %A P Naji %A M Farschtschian %A OHG Wilder-Smith %A CH Wilder-Smith %T Preoperative Epidural Tramadol, a Mixed Opioid and Monoaminergic Agonist for Perioperative Analgesia and Antinociception %D 1993 %R 10.1136/rapm-00115550-199318041-00010 %J Regional Anesthesia: The Journal of Neural Blockade in Obstetrics, Surgery, & Pain Control %P 9-9 %V 18 %N Suppl 4 %U https://rapm.bmj.com/content/rapm/18/Suppl_4/9.full.pdf