[1] IDIBELL, Catalan Inst Oncol ICO, Canc Epidemiol Res Program, Lhospitalet De Llobregat, Catalonia, Spain
[2] CIBER Epidemiol & Salud Publ CIBERESP, Madrid, Spain
[3] Hosp Santa Creu & Sant Pau, Barcelona, Spain
[4] German Canc Res Ctr, Heidelberg, Germany
[5] Univ Barcelona, Hosp Clin, E-08007 Barcelona, Spain
[6] Univ Hosp Tuebingen, Dept Pathol, Tubingen, Germany
[7] Med Univ Warsaw, Czerniakowski Hosp, Fac Med & Dent, Dept Otorhinolaryngol, Warsaw, Poland
[8] Hosp Gen Hosp, Barcelona, Spain
[9] Inst Nacl Cancerol, Bogota, Colombia
[10] Univ Nacl Colombia, Bogota, Colombia
[11] Insituto Oncol Oriente Boliviano, Lab Privado Patol Oncos, Santa Cruz, Bolivia
[12] Manchester Royal Infirm, Oxford Rd, Manchester M13 9WL, Lancs, England
[13] Charles Univ Prague, Fac Med, Fingerland Dept Pathol, Hradec Kralove, Czech Republic
[14] Univ Hosp, Hradec Kralove, Czech Republic
[15] Univ Ljubljana, Fac Med, Inst Microbiol & Immunol, Ljubljana, Slovenia
[16] Regina Elena Inst Canc Res, Rome, Italy
[17] Univ Nacl Asuncion, Inst Invest Ciencias Salud, Asuncion, Paraguay
[18] Univ Birmingham, Inst Head & Neck Studies & Educ, Birmingham, W Midlands, England
[19] Univ Montreal, Dept Social & Prevent Med, Montreal, PQ, Canada
[20] DDL Diagnost Lab, Rijswijk, Netherlands
[21] Univ Pompeu Fabra, Hosp del Mar IMIM, Dept Pathol, Barcelona, Spain
[22] Hosp SOLCA, Lab Clin & Mol, Guayaquil, Ecuador
[23] IMSS Mexico, Ctr Med Nacl Siglo 21, Hosp Oncol, Mexico City, DF, Mexico
[24] Catholic Univ Korea, Yeouido St Marys Hosp, Seoul, South Korea
[25] Natl Canc Ctr, Grad Sch Canc Sci & Policy, Goyang, South Korea
[26] Natl Canc Ctr, Natl Canc Control Inst, Goyang, South Korea
[27] Hosp Gen Jerez de la Frontera, Cadiz, Spain
[28] Univ Clin Ctr, Dept Pathol, Tuzla, Bosnia & Herceg
[29] Univ Lagos, Coll Med, Dept Oral Pathol, Lagos, Nigeria
[30] Ctr Canc Emma Romero Callejas, Tegucigalpa, Honduras
[31] Bangabandhu Sheikh Mujib Med Univ, Dept Obstet & Gynecol, Dhaka, Bangladesh
[32] Hosp Oncol SOLCA, Quito, Ecuador
[33] Hosp Gen Mexico City, Dept Pathol, Mexico City, DF, Mexico
[34] New York Hosp, Cornell Med Ctr, New York, NY 10021 USA
[35] Gomel State Med Univ, Gomel, BELARUS
[36] Inst Cancerol Dr Bernardo del Valle S, Guatemala City, Guatemala
[37] CHRU Gui De Chauliac, Montpellier, France
[38] Inst Portugues Oncol Francisco Gentil, Lisbon, Portugal
[39] Univ Philippines, Coll Med, Manila, Philippines
[40] Koc Univ, Sch Med, Istanbul, Turkey
[41] Hacettepe Univ, Sch Med, Ankara, Turkey
[42] Canc Prevent & Relief Soc, Raipur, Madhya Pradesh, India
[43] MLN Med Coll, Allahabad, Uttar Pradesh, India
[44] Inst Cytol & Prevent Oncol ICMR, Noida, Uttar Pradesh, India
[45] Univ Hawaii, Canc Res Ctr, Honolulu, HI 96822 USA
[46] Cedars Sinai Med Ctr, Los Angeles, CA 90048 USA
[47] Hosp Gen San Juan de Dios, Ctr Invest Epidemiol Salud Sexual Reprod CIESAR, Guatemala City, Guatemala
[48] Univ Nacl Autonoma Honduras, Escuela Microbiol, Tegucigalpa, Honduras
[49] Bayero Univ, Kano, Nigeria
[50] Minist Salud Prov Buenos Aires, Buenos Aires, DF, Argentina