title: Demographic aspects of natural family planning.
authors.affiliation: Research Division, Office of Population, Agency for International Development, Washington, DC 20523-1819.
authors.forename: J
authors.initials: J
authors.lastname: Spieler
authors.forename: S
authors.initials: S
authors.lastname: Thomas
mesh_terms: D000293:Adolescent; D000328:Adult; D005193:Family Planning Services / Q000379:methods / Q000706:statistics & numerical data*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged