1. Centers for Disease Control and Prevention. Genital HPV infection fact sheet.
Available at:
http://www.cdc.gov/std/hpv/stdfact-hpv.htm. 
Accessed July 22, 2005.

2. Weinstock H, Berman S, Cates Jr W. Sexually transmitted diseases among American youth: Incidence and prevalence estimates, 2000. Perspect Sex Reprod Health. 2004;36:6?10.

3. US Census Bureau. Annual estimates of the population by sex and five-year age groups for the United States: April 1, 2000 to July 1, 2004.

4. National Cancer Institute, Division of Cancer Prevention. About HPV Infections.
Available at:
http://www.cancer.gov/prevention/alts/abouthpv.html.
Accessed July 22, 2005.

5. Walboomers JMM, Jacobs MV, Manos MM, et al. Human papillomavirus is a necessary cause of invasive cervical cancer worldwide. J Pathol. 1999;189:12?19.

6. Winer RL, Lee S-K, Hughes JP, et al. Genital human papillomavirus infection: Incidence and risk factors in a cohort of female university students. Am J Epidemiol. 2003;157:218?226.

7. American Cancer Society. Prevention & early detection.
Available at:
http://www.cancer.org/docroot/PED/content/PED_2_3X_Pap_Test.asp.
Accessed June 30, 2005.

8. American Cancer Society. Cervical cancer.
Available at:
http://documents.cancer.org/115.00/115.00.pdf.
Accessed July 22, 2005.

9. Koutsky L. Epidemiology of genital human papillomavirus infection. Am J Med. 1997;102:3?8.

10. National Cancer Institute. Recent studies regarding HPV and cervical cancer: Questions and answers.
Available at:
http://cancernet.nci.nih.gov/cancertopics/factsheet/HPVCervicalQandA.
Accessed September 30, 2005

11. National Cervical Cancer Coalition. Patient information: Questions and answers about the Pap test.
Available at:
http://www.nccc-online.org/patient.php.
Accessed September 30, 2005.

12. National Cancer Institute. Cancer facts: Human papillomaviruses and cancer: Questions and answers.
Available at:
http://www.cancer.gov/ancertopics/factsheet/Risk/HPV.
Accessed September 30, 2005.

13. National Institute of Allergy and Infectious Diseases. Human papillomavirus and genital warts. July 2004.
Available at:
http://www.niaid.nih.gov/factsheets/stdhpv.htm.
Accessed July 22, 2005.

14. American Social Health Association. Human papillomavirus.
Available at:
http://www.ashastd.org/learn/learn_hpv_warts.cfm.
Accessed October 17, 2005.

15. Centers for Disease Control and Prevention. Sexually transmitted diseases. STD surveillance 2003.
Available at:
http://www.cdc.gov/std/stats/tables/table47.htm.
Accessed June 30, 2005.

16. American Cancer Society. Detailed guide: Vaginal cancer: What is vaginal cancer?
Available at:
http://www.cancer.org/docroot/CRI/content/
CRI_2_4_1X_What_is_vaginal_cancer_55.asp?sitearea=.
Accessed September 30, 2005.

17. American Cancer Society. Detailed guide: Vulvar cancer: What is vulvar cancer?
Available at:
http://www.cancer.org/docroot/CRI/content/
CRI_2_4_1X_What_is_vulvar_cancer_45.asp?sitearea=.
Accessed September 30, 2005.

18. American Cancer Society. Detailed guide: Anal cancer: What is anal cancer?
Available at:
http://www.cancer.org/docroot/
CRI/content/CRI_2_4_1X_What_is_anal_cancer_47.asp?sitearea=.
Accessed September 30, 2005.

19. International RRP ISA Center. FAQs.
http://www.rrpwebsite.org/whatis_rrp.shtml.
Accessed October 18, 2006.

20. Herrero R, Castellsague X, Pawlita M, et al. Human papillomavirus and oral cancer: The international agency for research on cancer multicenter study.
J Natl Cancer Inst. 2003;95:1772?1783.