[1] Inst Mexicano Seguro Social IMSS, Unidad Med Familiar 28, Mexico City, DF, Mexico
[2] IMSS, Ctr Med Nacl Raza, Unidad Invest Med Inmunol & Infectol, Mexico City, DF, Mexico
[3] IMSS, Hosp Gineco Pediat 3A, Mexico City, DF, Mexico
[4] IMSS, Ctr Med Nacl La Raza, Banco Cent Sangre, Mexico City, DF, Mexico
[5] Hosp Reg Alta Especialidad Zumpango, Zumpango De Ocampo, Mexico
[6] Inst Nacl Cancerol, Lab Virus & Canc, Secretaria Salud, Direccon Invest, Mexico City, DF, Mexico
[7] Univ Nacl Autonoma Mexico, Inst Nacl Cancerol, Secretaria Salud, Lab Virus & Canc,Unidad Invest Biomed Canc,Inst I, Mexico City, DF, Mexico
[8] IMSS, Ctr Med Nacl Siglo XXI, Area Envejecimiento UIESSAE, Unidad Invest Epidemiol & Serv Salud, Mexico City, DF, Mexico
[9] IMSS, Ctr Med Nacl Siglo XXI, Ctr Adiestramiento Invest Clin, Coordinac Invest Salud, Mexico City, DF, Mexico
[10] IMSS, Ctr Med Nacl Siglo XXI, Unidad Invest Med Enfermedades Oncol, UMAE Oncol, Mexico City, DF, Mexico
[11] IMSS, Hosp Oncol, Serv Radioterapia, Ctr Med Nacl Siglo XXI, Mexico City, DF, Mexico
[12] IMSS, Unidad Invest Med Inmunoquim, UMAE Especialidades, Ctr Med Nacl Siglo XXI, Av Cuauhtemoc 330, Mexico City 06720, DF, Mexico
[13] IMSS, Unidad Invest Epidemiol & Serv Salud UIESS, Ctr Med Nacl Siglo XXI, Av Cuauhtemoc 330, Mexico City 06720, DF, Mexico