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Meta-regression: the association between the risk of logarithm ORs and median dosage of dietary nitrite and nitrate for selected site-specific cancers; (a). Pancreatic cancer Median Nitrite dosage, (b). Bladder cancer: Median = Nitrite dosage, (c). Stomach cancer: Median = Nitrite dosage, (d). Kidney cancer: Median = Nitrate dosage, (e). Bladder cancer: Median = Nitrate dosage.
