Emergency contraception: what teens need to know.
D000293:Adolescent; D000367:Age Factors; D000569:Americas; D003267:Contraception; D003270:Contraceptive Agents; D003271:Contraceptive Agents, Female; D003281:Contraceptives, Postcoital; D003710:Demography; D019049:Developed Countries; D004467:Economics; D005193:Family Planning Services; D006301:Health Services Needs and Demand; D019359:Knowledge; D009656:North America; D011153:Population; D011154:Population Characteristics; D014481:United States
D003270:Contraceptive Agents; D003271:Contraceptive Agents, Female; D003281:Contraceptives, Postcoital
Adolescents; Age Factors; Americas; Contraception; Contraceptive Agents; Contraceptive Agents, Female; Contraceptive Agents, Postcoital; Demographic Factors; Developed Countries; Economic Factors; Family Planning; Fertility Control, Postcoital; Knowledge; Needs; North America; Northern America; Population; Population Characteristics; United States; Youth