[A doubtful practice of preventive value: universal screening for colorectal cancer].
Villalbí
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JR
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Plasencia
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D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D015179:Colorectal Neoplasms / Q000517:prevention & control*; D006801:Humans; D008403:Mass Screening; D008875:Middle Aged; D009780:Occult Blood; D012812:Sigmoidoscopy; D013997:Time Factors