RT Journal Article SR Electronic T1 The quadrivalent HPV vaccine is effective prophylaxis against HPV-related external genital lesions in young men JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 157 OP 158 DO 10.1136/ebm1405 VO 16 IS 5 A1 Donovan, Basil A1 Grulich, Andrew E YR 2011 UL http://ebm.bmj.com/content/16/5/157.abstract AB