Kasutatud kirjandus

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6. Ortho-McNeil Pharmceutical Inc. Ortho Evra (Norelgestromin/ Ethinyl estradiol transdermal system) 2001. Available at: http://www.ortho.mcneil.com/products/pi/pdfs/orthoevra.pdf. (Accessed 5 October 2003)
7. Ortho-McNeil Pharmaceutical Inc. Ortho Tri-Cyclen Lo tablets (norgestimate/ethinyl estradiol) 2002. Available at: http://www.ortho-mcneil.com/products/pi/pdfs/orthtricyclenlo.pdf (Accessed 5 October 2003)
8. Speroff L, Darney PD. Periodic Abstinence. A clinical guide for contraception. 3rd edn. Philadelphia, PA: Lippincott Williams and Wilkins, 2001
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