title: [Evaluation of the voluntary family planning program of the Instituto Mexicano del Seguro Social. I. Generalities, socioeconomic and demographic characteristics].
mesh_terms: D000293:Adolescent; D000328:Adult; D003710:Demography; D005069:Evaluation Studies as Topic; D005193:Family Planning Services; D005260:Female; D006801:Humans; D008800:Mexico; D011247:Pregnancy; D012959:Socioeconomic Factors
vernacular_title: Evaluación del programa de planificación familiar voluntaria del Instituto Mexicano del Seguro Social. I. Generalidades: características socioeconómicas y demográficas