References:
- Trussell J. Contraceptive failure in the United States. Contraception 2011; 83:397.
- Sundaram A, Vaughan B, Kost K, et al. Contraceptive failure in the United States. Perspect Sex Reprod Health 2017; 49:7.
Reproduced with permission from: Family Planning National Training Center. Birth Control Methods Options Chart. Available at:
www.fpntc.org/resources/birth-control-methods-options-chart (Accessed on January 24, 2019).