References
Johansson ED. Future developments in hormonal contraception. Am J Obstet Gynecol. 2004 Apr;190(4 Suppl):S69-71.
US Food and Drug Administration. Birth Control Guide. Rockville, MD: FDA Office of Public Affairs; December 2003.
Shulman LP. Advances in female hormonal contraception: current alternatives to oral regimens. Treat Endocrinol. 2003;2(4):247-56.
Roddy RE, Zekeng L, Ryan KA, Tamoufé U, Tweedy KG. Nonoxynol-9 gel did not improve protection against sexually transmitted infections in condom users. Evidence-based Obstetrics & Gynecology. 2002; 4(4): 177-178.
Mishell DR Jr. State of the art in hormonal contraception: an overview. Am J Obstet Gynecol. 2004; 190(4 Suppl): S1-4.
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