World Health Organization. Human papillomavirus vaccines: WHO position paper May 2017. Wkly Epidemiol Rec. 2017, 92, 241–268.
Bergman H, Buckley BS, Villanueva G, Petkovic J, Garritty C, Lutje V, Riveros-Balta AX, Low N, Henschke N. Comparison of different human papillomavirus (HPV) vaccine types and dose schedules for prevention of HPV-related disease in females and males. Cochrane Database Syst Rev. 2019 Nov 22;2019(11):CD013479.