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First, the bias covariates used, although carefully extracted and evaluated, were based on observable study characteristics and thus may not fully capture unobserved characteristics such as study quality or context, which might be major sources of bias

Similarly, in the case of Celiac Disease (an autoimmune disorder triggered by gluten consumption), the immune system reacts abnormally to gluten a protein found in wheat, barley, and rye

Tobacco advertisers circumvented the ad ban by sponsoring sporting events that were televised, with cigarette billboards placed in stadiums that they could be seen on TV

Source uses petrographic analysis to derive the origins of red clay pipes throughout the east coast