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10. The "morning-after pill"--a preliminary report. Haspels AA IPPF Med Bull; 1969; 3(3):6. PubMed ID: 12275493 [TBL] [Abstract][Full Text] [Related]
11. Postcoital contraception: How effective and what fetal risk, if ineffective?? Proudfit CM JAMA; 1977 Dec; 238(25):2728-9. PubMed ID: 12260335 [TBL] [Abstract][Full Text] [Related]
12. The morning-after pill. Demers LM N Engl J Med; 1971 May; 284(18):1034-6. PubMed ID: 5553470 [TBL] [Abstract][Full Text] [Related]