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Contraceptives, Postcoital
Spermatocidal Agents
Nonoxynols
Combined Oral Contraceptives
Levonorgestrel
Contraceptives, Postcoital, Hormonal
Nonprescription Drugs
Pregnancy
Postcoital Contraception
Contraception
Pregnancy Tests
United States
Unwanted Pregnancies
Emergencies
Health Services Accessibility
Randomized Controlled Trials
Time Factors
Sexual Behavior
Contraception Behavior
Coitus
Co-Publications
6
4
3
2
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