title: Primary care epidemiology: its scope and purpose.
authors.forename: Philip C
authors.initials: PC
authors.lastname: Hannaford
authors.forename: Blair H
authors.initials: BH
authors.lastname: Smith
authors.forename: Alison M
authors.initials: AM
authors.lastname: Elliott
mesh_terms: D004812:Epidemiologic Methods; D006801:Humans; D011320:Primary Health Care / Q000379:methods*; D012680:Sensitivity and Specificity