title: Contraception: short-term vs. long-term failure rates.
authors.forename: J A
authors.initials: JA
authors.lastname: Ross
mesh_terms: D003267:Contraception / Q000379:methods*; D003268:Contraception Behavior; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D011247:Pregnancy; D012307:Risk Factors; D014481:United States