title: Epidemiologic evidence for an ecological phenomenon.
authors.affiliation: Department of Obstetrics and Gynecology, Division of Reproductive Endocrinology and Infertility, University of North Carolina, Chapel Hill, North Carolina, USA.
authors.forename: Anne Z
authors.initials: AZ
authors.lastname: Steiner
mesh_terms: D003267:Contraception / Q000706:statistics & numerical data*; D005260:Female; D006801:Humans; D016742:Preconception Care / Q000706:statistics & numerical data*; D011247:Pregnancy; D012744:Sex Ratio; D013315:Stress, Psychological / Q000453:epidemiology*; D061685:Time-to-Pregnancy