title: Opt out, not opt in.
authors.forename: Mark H
authors.initials: MH
authors.lastname: Yudin
mesh_terms: D005260:Female; D005315:Fetal Diseases / Q000175:diagnosis*; D015658:HIV Infections / Q000175:diagnosis* / Q000517:prevention & control / Q000635:transmission*; D006801:Humans; D018445:Infectious Disease Transmission, Vertical / Q000517:prevention & control*; D011247:Pregnancy; D011296:Prenatal Diagnosis / Q000379:methods*