Case-control studies of colorectal cancer mortality: is the case made for screening sigmoidoscopy?
Shapiro
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D016022:Case-Control Studies; D015179:Colorectal Neoplasms / Q000401:mortality* / Q000517:prevention & control*; D006801:Humans; D008403:Mass Screening; D016017:Odds Ratio; D012107:Research Design; D012812:Sigmoidoscopy