Mohammadi, M.; Tadger, P.; Sadeghi, A.; Salehi, N.; Rajabnia, M.; Paraandavaji, E.; Shafiei, S.; Pirani, A.; Hatamnejad, M. R.; Taherifard, E. Opium Use and Gastrointestinal Cancers: A Systematic Review and Meta-Analysis Study. Gastroenterol Hepatol Bed Bench 2024, 17.