Mohammadi N, Alimohammadian M, Feizesani A, Poustchi H, et al. The marginal causal effect of opium consumption on the upper gastrointestinal cancer death using parametric g-formula: An analysis of 49,946 cases in the Golestan Cohort Study, Iran. PLoS One 2021;16:e0246004.
PMID: 33493241