title: Importance of bias analysis in epidemiologic research.
authors.affiliation: Division of Epidemiology and Community Health, University of Minnesota, School of Public Health, Minneapolis, MN.
authors.forename: Richard F
authors.initials: RF
authors.lastname: MacLehose
authors.forename: Martha M
authors.initials: MM
authors.lastname: Werler
mesh_terms: D000013:Congenital Abnormalities / Q000453:epidemiology*; D005260:Female; D006801:Humans; D002189:Marijuana Abuse / Q000453:epidemiology*; D018811:Maternal Exposure / Q000706:statistics & numerical data*; D057566:Self Report