Ahmed, MD, S. A., M. S. Abdelghany, MD, and M. E. Afandy, MD. “The Effect of Opioid-Free Anesthesia on the Post-Operative Opioid Consumption in Laparoscopic Bariatric Surgeries: A Randomized Controlled Double-Blind Study”. Journal of Opioid Management, vol. 18, no. 1, Jan. 2022, pp. 47-56, doi:10.5055/jom.2022.0694.