title: Cancer, cohorts, confounding and consensus.
authors.forename: A H
authors.initials: AH
authors.lastname: MacLennan
mesh_terms: D001943:Breast Neoplasms / Q000175:diagnosis / Q000453:epidemiology; D015331:Cohort Studies; D015914:Estrogen Replacement Therapy / Q000009:adverse effects*; D005189:False Positive Reactions; D005260:Female; D006801:Humans; D008327:Mammography; D016032:Randomized Controlled Trials as Topic