[1] Sexual Hlth Clin, Family Federat Finland, Helsinki, Finland
[2] Univ New Mexico, Hlth Sci Ctr, Dept Pathol, Albuquerque, NM 87131 USA
[3] Univ New Mexico, Hlth Sci Ctr, Dept Obstet & Gynecol, Albuquerque, NM 87131 USA
[4] Univ Helsinki, Dept Obstet & Ginecol, Helsinki, Finland
[5] Hosp Llobregat, Biomed Res Ctr Network Epidemiol & Publ Hlth CIBE, DIBELL, ICO,Canc Epidemiol Res Program, Catalonia, Spain
[6] Univ Melbourne, Royal Womens Hosp, Murdoch Childrens Res Inst, Microbiol & Infect Dis Dept, Melbourne, Vic, Australia
[7] Univ Melbourne, Murdoch Childrens Res Inst, Dept Obstet & Gynaecol, Melbourne, Vic, Australia
[8] Telethon Inst Child Hlth Res, Vaccine Trials Grp, Perth, WA, Australia
[9] Univ Sydney, Childrens Hosp Westmead, Discipline Paediat & Child Hlth, Sydney, NSW 2006, Australia
[10] Univ Fed Rio Grande do Sul, Hosp Clin Porto Alegre, Porto Alegre, RS, Brazil
[11] Inst Mexicano Seguro Social, Unidad Invest Epidemiol, Cuernavaca, Morelos, Mexico
[12] Inst Mexicano Seguro Social, Serv Salud, Cuernavaca, Morelos, Mexico
[13] Natl Taiwan Univ, Coll Med & Hosp, Dept Obstet & Gynecol, Taipei 10764, Taiwan
[14] St Marys Hosp, Cent Manchester Univ Hosp NHS Fdn Trust, Manchester Acad Hlth Sci Ctr, Manchester M13 0JH, Lancs, England
[15] Univ Estadual Campinas, Campinas, SP, Brazil
[16] Chulalongkorn Univ, Fac Med, Dept Obstet & Gynaecol, Bangkok 10330, Thailand
[17] Univ Philippines, Philippine Gen Hosp, Coll Med, Makati Med Ctr, Makati, Philippines
[18] Queen Mary Univ London, Ctr Canc Prevent, Wolfson Inst Prevent Med, London, England
[19] Univ Alberta, Edmonton, AB, Canada
[20] Univ Manitoba, Winnipeg, MB, Canada
[21] Univ Wurzburg, Acad Teaching Hosp, Stiftung Juliusspital, Cent Lab, Wurzburg, Germany
[22] Univ Wurzburg, Acad Teaching Hosp, Stiftung Juliusspital, Vaccinat Ctr, Wurzburg, Germany
[23] Univ Hosp KU Leuven Gasthuisberg, Dept Gynaecol, Leuven, Belgium
[24] Network Cooperat Canc Res RTICC, Inst Catala Oncol, IDIBELL, Canc Epidemiol Res Program, Catalonia, Spain
[25] Ctr AIDS Programme Res Soth Africa, Durban, South Africa
[26] Vrije Univ Brussel, Univ Ziekenhuis Brussel, Afdelingshoofd Gynaecol Oncol, Brussels, Belgium
[27] GSK Vaccines, Wavre, Belgium
[28] Univ Tampere, Sch Publ Hlth, FIN-33101 Tampere, Finland
[29] GSK Vaccines, King Of Prussia, PA USA