Letter: Post-coital estrogen.
D000293:Adolescent; D000328:Adult; D003282:Contraceptives, Postcoital, Hormonal; D004966:Estrogens, Conjugated (USP); D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D011247:Pregnancy; D013997:Time Factors
D003282:Contraceptives, Postcoital, Hormonal; D004966:Estrogens, Conjugated (USP)