Adapted from: U.S. Selected Practice Recommendations for Contraceptive Use, 2013: Adapted from the World Health Organization Selected Practice Recommendations for Contraceptive Use, 2nd Edition. MMWR Morb Mortal Wkly Rep 2013; 62:1.
Additional information from:
- Trussell J, Aiken ARA, Mickes E, Guthrie K. Efficacy, Safety, and Personal Considerations. In: Contraceptive Technology, 21st ed, Hatcher RA, Nelson AL, Trussell J, et al (Eds), Ayer Company Publishers, Inc., New York 2018.