Levonorgestrel-only emergency contraception: real-world tolerance and efficacy

Timing of Sexual Intercourse in Relation to Ovulation — Effects on the Probability of Conception, Survival of the Pregnancy, and Sex of the Baby

Allen J. Wilcox, Clarice R. Weinberg, Donna D. Baird · New England Journal of Medicine · 1995 · 1.1K citations

Randomised controlled trial of levonorgestrel versus the Yuzpe regimen of combined oral contraceptives for emergency contraception

The Lancet · 1998 · 733 citations

Contraception, Contraceptive Use, Contraceptive Implants +14

Randomised controlled trial of levonorgestrel versus the Yuzpe regimen of combined oral contraceptives for emergency contraception

Helena von Hertzen, Franziska Paul · 1998 · 450 citations

Contraceptive Use, Hormonal Contraceptive, Oral Contraceptive +25

The timing of the "fertile window" in the menstrual cycle: day specific estimates from a prospective study

Allen J. Wilcox · BMJ · 2000 · 440 citations · Full text

Updated estimates of the effectiveness of the Yuzpe regimen of emergency contraception

James Trussell, Germán Rodrı́guez, Charlotte Ellertson · Contraception · 1999 · 159 citations

Pregnancy Prevention, Contraception, Contraceptive Use +14