1. Genital HPV infectionfact sheet.
2. Human papillomaviruses. IARC monographs on the evaluation of carcinogenic risk to humans (vol. 90) Monograph.
3. NYS guidelines recommendations on anal Pap smears.
4. Ass backwards: The medias silence about rampant anal sex.;William
5. Screening for anal cancer: Who, when, and how.;Wilkin