AIN anal intraepithelial neoplasia aPR adjusted prevalence ratio ED emergency department GNV gender-neutral HPV vaccination HPV human papillomavirus HR-HPV high-risk human papillomavirus JBI Joanna Briggs Institute LR-HPV low-risk human papillomavirus MeSH Medical Subject Headings MSM men who have sex with men NPCR National Programme of Cancer Registries (Centres for Disease Control and Prevention) OPC oropharyngeal cancer PeIN penile intraepithelial neoplasia PRISMA 2020 Preferred Reporting...