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References: Delvin, David. "Choosing a Contraceptive Method." Netdoctor. Expedia, 24 Oct. 2012. Web. 31 Mar. 2014. John M. "Extended-cycle Pill." - 12 Types of Birth Control. N.p., n.d. Web. 31 Mar. 2014. http://sourceforge.net/projects/sevenzip/postdownload?source=dlp RH Activity: Prevention Advertisement 17