World contraceptive use in 1987.
D003267:Contraception; D003268:Contraception Behavior; D019049:Developed Countries; D003906:Developing Countries; D005193:Family Planning Services; D007390:International Agencies; D009938:Organizations; D015995:Prevalence; D012106:Research; D012107:Research Design; D013223:Statistics as Topic; D014480:United Nations