Review
Effects of acetaminophen on morphine side-effects and consumption after major surgery: meta-analysis of randomized controlled trials.
Br J Anaesth. 2005 Apr 1;94(4):505-13.
Randomized Controlled Trial
Prospective randomized clinical trial comparing patient-controlled intravenous analgesia with patient-controlled epidural analgesia after lumbar spinal fusion.
Spine. 2003 Apr 15;28(8):739-43.