Preadolescent pregnancy: a market segmentation perspective.
D000293:Adolescent; D003273:Contraceptive Devices / Q000706:statistics & numerical data; D005193:Family Planning Services / Q000458:organization & administration*; D005260:Female; D006801:Humans; D008281:Maine; D008297:Male; D008389:Marketing of Health Services / Q000379:methods*; D011247:Pregnancy; D011253:Pregnancy in Adolescence; D012107:Research Design; D012725:Sexual Behavior