Screening for gastrointestinal bleeding.
D000368:Aged; D005260:Female; D006471:Gastrointestinal Hemorrhage / Q000175:diagnosis; D005770:Gastrointestinal Neoplasms / Q000453:epidemiology*; D006801:Humans; D008297:Male; D008403:Mass Screening; D008875:Middle Aged; D009780:Occult Blood; D010349:Patient Compliance