Human Papilloma virus immunization is cost effective if immunity is life-long, and if all 12-year old girls are immunized (in the USA). Rev Port Med Geral Fam [Internet]. 2008 Sep. 1 [cited 2026 Apr. 18];24(5):641-2. Available from: https://rpmgf.pt/ojs/index.php/rpmgf/article/view/10555