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→Infection with human papilloma virus: Wikify.
|volume=322
|pages=1312-5
}}</ref> At least one study suggests that [[circumcised ]] men are at higher risk for HPV infection,<ref name="cook1993">{{REFjournal
|last=Cook
|init=LS
|init3=KK
|url=http://www.cirp.org/library/disease/STD/cook2/
|title=Clinical presentation of genital warts among circumcised and [[uncircumcised]] heterosexual men attending an urban STD clinic
|journal=Genitourin Med
|date=1993
|volume=69
|pages=262-4
}}</ref> making being [[circumcised ]] a risk factor.
===Use of tobacco===