Effect of the human papillomavirus (HPV) quadrivalent vaccine in a subgroup of women with cervical and vulvar disease: retrospective pooled analysis of trial dataBMJ 2012; 344 doi: http://dx.doi.org/10.1136/bmj.e1401 (Published 27 March 2012) Cite this as: BMJ 2012;344:e1401
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