Measuring contraceptive effectiveness: a conceptual framework
Obstetrics and gynecology, 89(1), 157-158, 1997
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Stanford JB (1997). Measuring contraceptive effectiveness: a conceptual framework. *Obstetrics and gynecology*. https://doi.org/10.1016/s0029-7844(97)84261-5
Stanford JB. Measuring contraceptive effectiveness: a conceptual framework. Obstet Gynecol..
Stanford, J. B. "Measuring contraceptive effectiveness: a conceptual framework." *Obstetrics and gynecology*.