1. American Cancer Society. (2017). HPV and cancer. Retrieved Febuary 17, 2018 from
https://www.cancer.org/cancer/cancer-causes/infectious-agents/hpv/hpv-and-cancer-info.html
.
2. Centers for Disease Control and Prevention. (2017). Genital HPV infection - CDC fact sheet. Retrieved January 30, 2018 from
http://www.cdc.gov/std/HPV/STDFact-HPV.htm
.
3. Centers for Disease Control and Prevention. (2018). Human papillomavirus (HPV) and cancer. Retrieved Febuary 20, 2018 from
https://www.cdc.gov/cancer/hpv/index.htm
.
4. American Cancer Society. (2017). What are the key statistics about cervical cancer? Retrieved Febuary 16, 2018 from
http://www.cancer.org/cancer/cervicalcancer/detailedguide/cervical-cancer-key-statistics
.
5. Centers for Disease Control and Prevention. (2015). HPV and cancer. Retrieved Febuary 16, 2018 from
http://www.cdc.gov/hpv/cancer.html
.