title: [Efficiency in the use of contraception in the voluntary family planning program of the Institute Mexicano del Seguro Social].
mesh_terms: D003267:Contraception / Q000379:methods*; D005193:Family Planning Services / Q000639:trends*; D005260:Female; D006801:Humans; D008800:Mexico; D009313:National Health Programs; D011247:Pregnancy; D013997:Time Factors
vernacular_title: Efectividad en el uso de la anticoncepción en el Programa de Planificación Familiar Voluntaria del Instituto Mexicano del Seguro Social.