Yardeni, MD, I. Z., B. Beilin, MD, E. Mayburd, MD, Y. Alcalay, MSc, and H. Bessler, PhD. “Relationship Between Fentanyl Dosage and Immune Function in the Postoperative Period”. Journal of Opioid Management, vol. 4, no. 1, Jan. 2018, pp. 27-33, doi:10.5055/jom.2008.0005.