title: Interviewer bias and maternal bias.
authors.forename: M L
authors.initials: ML
authors.lastname: Martínez-Frías
mesh_terms: D015982:Bias; D016022:Case-Control Studies; D000013:Congenital Abnormalities / Q000453:epidemiology*; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D011247:Pregnancy; D013030:Spain / Q000453:epidemiology