[1] Ludwig Inst Canc Res, Dept Virol, BR-01509010 Sao Paulo, SP, Brazil
[2] Univ Iowa, Dept Obstet Gynecol & Epidemiol, Iowa City, IA USA
[3] Univ Arizona, Ctr Canc, Tucson, AZ USA
[4] Inst Brasileiro Controle Canc, Dept Gynecol, Sao Paulo, Brazil
[5] Hosp Canc, Sao Paulo, Brazil
[6] Univ Estadual Campinas, Dept Obstet & Gynecol, Campinas, Brazil
[7] CERHFAC, Ctr Human Reprod Studies & Clin Trials, Curitiba, Parana, Brazil
[8] Indiana Univ, Sch Med, Dept Med, Indianapolis, IN 46204 USA
[9] McGill Univ, Dept Pathol, Montreal, PQ, Canada
[10] SMBD Jewish Gen Hoso, Montreal, PQ, Canada
[11] Dartmouth Med Sch, Norris Cotton Canc Ctr, Dept Obstet & Gynecol, Hanover, NH USA
[12] Dartmouth Med Sch, Norris Cotton Canc Ctr, Dept Community & Family Med, Hanover, NH USA
[13] Univ Washington, Sch Publ Hlth, Dept Epidemiol, Seattle, WA 98195 USA
[14] Johns Hopkins Univ, Sch Med, Dept Pathol, Baltimore, MD 21205 USA
[15] Natl Publ Hlth Inst, Dept Infect Dis Epidemiol, Helsinki, Finland
[16] Danderyd Hosp, Karolinska Inst, Stockholm, Sweden
[17] SINTEF Hlth Res, Dept Epidemiol, Trondheim, Norway
[18] Univ Hosp, Lund, Sweden
[19] Univ Virginia, Sch Med, Dept Pathol, Charlottesville, VA 22908 USA
[20] Univ New Mexico, Dept Mol Genet & Microbiol, Albuquerque, NM 87131 USA
[21] Univ New Mexico, Dept Obstet & Gynecol, Albuquerque, NM 87131 USA
[22] Merck Res Labs, Dept Vaccine, West Point, PA USA
[23] Merck Res Labs, Dept Biol Res, West Point, PA USA
[24] Merck Res Labs, Dept Biostat, West Point, PA USA
[25] Merck Res Labs, Dept Med Commun, West Point, PA USA
[26] Merck Res Labs, Dept Biol Clin Res, West Point, PA USA