title: [A doubtful practice of preventive value: universal screening for colorectal cancer].
authors.forename: J R
authors.initials: JR
authors.lastname: Villalbí
authors.forename: A
authors.initials: A
authors.lastname: Segura
authors.forename: A
authors.initials: A
authors.lastname: Plasencia
mesh_terms: 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