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→Infection with human papilloma virus: Wikify.
|issue=15
|pages=916-23
}}</ref> [[Ronald L. Poland | Poland]] identified human papilloma virus (HPV) types 16 and 18 as the cause of penile and cervical cancers in 1990, and that they could be spread by sexual contact.<ref name="poland1990">{{REFjournal
|last=Poland
|init=RL