U. Kosciuczuk, P. Knapp, and A. M. Lotowska-Cwiklewska, “Opioid-induced immunosuppression and carcinogenesis promotion theories create the newest trend in acute and chronic pain pharmacotherapy”, Clinics, vol. 75, p. e1554, Mar. 2020, doi: 10.6061/clinics/2020/e1554.