Unlugenc, MD, Hakki, Sibel Tetiker, MD, Selim Büyükkurt, MD, Tayfun Guler, MD, and Geylan Isik, MD. 2018. “Comparison of the Effect of Adding Remifentanil to Patient-Controlled Tramadol or Morphine for Postoperative Analgesia After Major Abdominal Surgery”. Journal of Opioid Management 5 (5):247-55. https://doi.org/10.5055/jom.2009.0027.