Reply to Kathleen D'Hauwers, Gunter De Win and Wiebren Tjalma's letter to the editor re: Katja Kero, Jaana Rautava, Kari Syrjänen, Seija Grenman, Stina Syrjänen. Oral mucosa as a reservoir of human papillomavirus: point prevalence, genotype distribution, and incident infections among males in a 7-year prospective study. Eur Urol 2012;62:1063-70