Reference:
1. Centers for Disease Control and Prevention. Contraception. Available from: https://www.cdc.gov/reproductivehealth/contraception/unintendedpregnancy/pdf/Contraceptive_methods_508.pdf
2. Centers for Disease Control and Prevention. U.S. selected practice recommendations for contraceptive use. Morbidity and Mortality Weekly Report 2013;62:1-64.
3. Guilbert E, Black A, Dunn S, Senikas V. Missed hormonal contraceptives: new recommendations. J Obstet Gynaecol Can 2008;219:1050-62.
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