Christiansen, K. ., T. M. . Joergensen, and H. I. . Jensen. “Postoperative Pain Treatment in Day Surgery: A Quality Improvement Study Examining the Needs of Opioid and Effects of Oxycodone and Morphine”. Annals of Anesthesiology and Critical Care, vol. 3, no. 2, Apr. 2019, pp. 1-8, https://journals.sbmu.ac.ir/index.php/anescc/article/view/33463.