Dehlendorf Christine, Bellanca Helen, Policar Michael
Department of Family & Community Medicine, University of California, San Francisco, CA 94110; Department of Obstetrics, Gynecology & Reproductive Sciences, University of California, San Francisco, CA 94110; Department of Epidemiology & Biostatistics, University of California, San Francisco, CA 94110.
Department of Family Medicine, Oregon Health and Science University, Portland, OR 97239.
Contraception. 2015 Jun;91(6):433-7. doi: 10.1016/j.contraception.2015.02.002. Epub 2015 Feb 10.