title: Choice of denominator in studies of cigarette purchases by minors.
authors.forename: A
authors.initials: A
authors.lastname: Nyhuis
authors.forename: I
authors.initials: I
authors.lastname: Schoenmakers
authors.forename: C
authors.initials: C
authors.lastname: Rissel
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D003132:Commerce; D005260:Female; D006801:Humans; D016015:Logistic Models; D008297:Male; D009517:New South Wales; D016017:Odds Ratio; D012907:Smoking / Q000191:economics; D000074606:Smoking Prevention