title: Screening for gastrointestinal disease--a critical analysis.
authors.affiliation: Department of Medicine, University of Calgary.
authors.forename: E A
authors.initials: EA
authors.lastname: Shaffer
mesh_terms: D002170:Canada; D004032:Diet; D004781:Environmental Exposure; D005260:Female; D005767:Gastrointestinal Diseases / Q000453:epidemiology* / Q000209:etiology / Q000401:mortality; D005770:Gastrointestinal Neoplasms / Q000453:epidemiology* / Q000209:etiology / Q000401:mortality; D006801:Humans; D008297:Male; D012307:Risk Factors