The adolescent and health service research.
D000022:Abortion, Spontaneous; D000293:Adolescent; D002668:Child Rearing; D005260:Female; D005298:Fertility; D006301:Health Services Needs and Demand; D006302:Health Services Research / Q000379:methods*; D006801:Humans; D008393:Marriage; D011247:Pregnancy; D011253:Pregnancy in Adolescence; D012107:Research Design; D012725:Sexual Behavior