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The effect of opium on severity of COVID-19 infection:An original study from Iran. 

Riahi T, Sadeghzadeh-Bazargan A, Shokri S, Ahmadvand D, Hassanlouei B, Baghestani A, Khazaeian A, Seifi Gharabaghloo F, Hassanzadeh M, Goodarzi A. 

Med J Islam Repub Iran. 2021 Sep 8;35:115. doi: 10.47176/mjiri.35.115. PMID: 34956961; PMCID: PMC8683804.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8683804/