[1] Hosp Infectol Dr Daniel Mendez Hernandez La Raza, IMSS, Unidad Invest Med Inmunol & Infectol, Mexico City, DF, Mexico
[2] UMAE Hosp Pediat, Ctr Med Nacl Siglo 21, Inst Mexicano Seguro Social, Unidad Invest Med Epidemiol Clin, Mexico City, DF, Mexico
[3] UMAE, Inst Mexicano Seguro Social, Serv Pediat, Yucatan, Mexico
[4] Inst Nacl Med Genom INMEGEN, Lab Genom Canc, Mexico City, DF, Mexico
[5] Hosp Ohoran, Serv Oncolo Pediat, Yucatan, Mexico
[6] Hosp Gen Gaudencio Gonzalez Garza, Ctr Med Nacl La Raza, Serv Hematol Pediat, Mexico City, DF, Mexico
[7] Hosp Infantil Mexico Dr Federico Gomez, Serv Hematooncol, Secretaria Salud SSa, Mexico City, DF, Mexico
[8] Unidad Med Alta Especialidad IMSS Merida, Unidad Invest Med Yucatan, Registro Canc, Yucatan, Mexico
[9] Hosp Juarez Mexico, Serv Oncopediat, Secretaria Salud SSa, Mexico City, DF, Mexico
[10] Hosp Gen Mexico City, Serv Hematol Pediat, Secretaria Salud SSa, Mexico City, DF, Mexico
[11] Hosp Pediat Moctezuma, Secretaria Salud DF Mexico, Mexico City, DF, Mexico
[12] Hosp Gen Reg 1 Carlos McGregor Sanchez Navarro, IMSS, Mexico City, DF, Mexico
[13] UMAE Hosp Pediat, Ctr Med Nacl Siglo 21, IMSS, Serv Hematol Pediat, Mexico City, DF, Mexico
[14] Hosp Juarez Mexico, Lab Unidad Invest Enfermedades Metab & Endocrinas, Mexico City, DF, Mexico
[15] Inst Nacl Cardiol Ignacio Chavez, Dept Biol Mol, Ciudad De Mexico, Mexico
[16] IMSS, Coordinac Invest Salud, Mexico City, DF, Mexico
[17] Inst Mexicano Seguro Social, Inst Seguridad Social Serv Trabajadores Estado, Mexican Interinst Grp Identificat Causes Childhoo, Secretaria Salud Gobierno, Mexico City, DF, Mexico