Murphy, MD JD, Yan, MD D, Hanna, MD MN, Bravos, MD ED, Isaac, MD, PhD GR, Eng, MD CA, Wu, MD CL. Comparison of the postoperative analgesic efficacy of intravenous patient-controlled analgesia with tramadol to intravenous patient-controlled analgesia with opioids. J of Opioid Management [Internet]. 2018 Jan. 29 [cited 2024 May 4];6(2):141-7. Available from: https://wmpllc.org/ojs/index.php/jom/article/view/881