title: Invited commentary: simple models for a complicated reality.
authors.affiliation: Epidemiology Branch, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD. schistee@mail.nih.gov
authors.forename: Enrique F
authors.initials: EF
authors.lastname: Schisterman
authors.forename: Sonia
authors.initials: S
authors.lastname: Hernández-Díaz
mesh_terms: D001724:Birth Weight; D015986:Confounding Factors, Epidemiologic; D005260:Female; D006801:Humans; D007226:Infant Mortality; D007231:Infant, Newborn; D011247:Pregnancy; D012307:Risk Factors; D012907:Smoking / Q000009:adverse effects / Q000453:epidemiology