1. 1. American Social Health Association . Learn about HPV: fast facts . 2007 . Available at: http://www.ashastd.org/learn/learn_hpv_facts.cfm. Accessed February 15, 2007.
2. 2. Centers for Disease Control and Prevention . Genital HPV infection: CDC fact sheet . 2004 . Available at: http://www.cdc.gov/std/HPV/STDFact-HPV.htm. Accessed February 15, 2007.
3. 3. Centers for Disease Control and Prevention . Record of the Meeting of the Advisory Committee On Immunization Practices , February 21-22, 2006. 2007 . Available at: http://www.cdc.gov/nip/ACIP/minutes/acip_min_feb06.pdf. Accessed March 23, 2007.
4. Prevalence of HPV Infection Among Females in the United States