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