title: [Methodologic bias in prevalence studies of smoking habit during pregnancy].
authors.forename: Pedro M
authors.initials: PM
authors.lastname: Mateos
authors.forename: José M
authors.initials: JM
authors.lastname: Aranda
mesh_terms: D015982:Bias; D016021:Epidemiologic Studies; D005260:Female; D006801:Humans; D011247:Pregnancy; D015995:Prevalence; D012907:Smoking / Q000453:epidemiology*