Letter-to-the-Editor in response to Tanton C, Mesher D, Beddows S, Soldan K, Clifton S, Panwar K, Field N, Mercer CH, Johnson AM, Sonnenberg P. Human papillomavirus (HPV) in young women in Britain: Population-based evidence of the effectiveness of the bivalent immunisation programme and burden of quadrivalent and 9-valent vaccine types. Papillomavirus Res. 2017 Jun;3:36-41. doi: 10.1016/j.pvr.2017.01.001