Afshari, Mahdi, Iraj Shahramian, Morteza Salarzaei, Hadi Mirzaie, and Fateme Parooie. 2022. “Opium Use and COVID-19 Infection, a Retrospective  Study in Iran”. Medicni Perspektivi 27 (3):122-27. https://doi.org/10.26641/2307-0404.2022.3.265958.