Gynecol Oncol. 2009 Dec;115(3 Suppl):S15-23. doi: 10.1016/j.ygyno.2009.09.021. Epub 2009 Oct 12.
HPV vaccination against cervical cancer in women above 25 years of age: key considerations and current perspectives.
Castellsagué X, Schneider A, Kaufmann AM, Bosch FX.