1. United States Agency for International Development (USAID). USAID's Family Planning Guiding Principles and U.S. Legislative and Policy Requirements. Available in: http://wwwusaidgov/our_work/global_health/pop/voluntarismhtml.
2. Informed choice in family planning. Helping people decide;Upadhyay;Popul Rep J,2001
3. Contraception: from accessibility to efficiency;Bajos;Hum Reprod,2003
4. Factors associated with contraceptive use and nonuse, United States, 2004;Frost;Perspect Sex Reprod Health,2007
5. World Health Organization. Improving access to quality care in family planning: medical eligibility criteria for contraceptive use. Geneva; 2004 (available in: http://www. who.int/reproductive-health/publications/MEC_3/mec.pdf).