1. Population disparity: attitudes about The IUD in Europe and the United States;Sonfield;Guttmacher Policy Rev,2007
2. Long-term contraception protection, discontinuation and switching behavior: intrauterine device (IUD) use dynamics in 14 developing countries;Ali,2011
3. Update on and correction to the cost-effectiveness of contraceptives in the United States;Trussell;Contraception,2012
4. Intrauterine devices and pelvic inflammatory disease: an international perspective;Farley;Lancet,1992
5. Mechanism of action, safety and efficacy of intrauterine devices. Report of a WHO Scientific Group. World Health Technical Report Series, 1987:1–91.