title: Occult-blood screening.
authors.forename: J W
authors.initials: JW
authors.lastname: Frank
mesh_terms: D000368:Aged; D003110:Colonic Neoplasms / Q000175:diagnosis; D006801:Humans; D008875:Middle Aged; D009780:Occult Blood; D012004:Rectal Neoplasms / Q000175:diagnosis; D013997:Time Factors