WHO International Standards for antibodies to HPV6 HPV11 HPV31 HPV33 HPV45 HPV52 and HPV58 oleh Troy J. Kemp, Gitika Panicker, Carina Eklund, Jianhui Nie, Youchun Wang, Simon Beddows, Peter Rigsby, Weijin Huang, Joakim Dillner, Elizabeth R. Unger, Ligia A. Pinto, Dianna E. Wilkinson, the collaborative study participants