[1] Univ Mil Nueva Granada, Hosp Mil Cent, Pediat Dept, Trasversal 3 49-02, Bogota, Colombia
[2] Univ Mil Nueva Granada, Fac Med, Trasversal 3 49-02, Bogota, Colombia
[3] Hosp Univ Fdn Santa Fe Bogota, Hosp La Misericordia, Pediat Palliat Care Unit, Av Caracas 1-65,Carrera 7 117 15, Bogota, Colombia
[4] Hosp Mil Cent, Av Caracas 1-65,Carrera 7 117 15, Bogota, Colombia
[5] Pontificia Univ Javeriana, Fac Med, Dept Clin Epidemiol & Biostat, PhD Program Clin Epidemiol, Carrera 7 40 62, Bogota, Colombia
[6] Hosp Univ Fdn Santa Fe Bogota, Pediat Dept, Carrera 7 117-15, Bogota, Colombia
[7] Fac Ciencias Med Santa Casa Sao Paulo, Dept Collect Hlth, Rua Doutor Cesario Motta Jr 61, Sao Paulo, SP, Brazil
[8] Natl Canc Inst, Argentinian Pediat Oncol Registry, Minist Hlth, JA Roca 781 Piso 11 CABA, Buenos Aires, DF, Argentina
[9] Pontificia Univ Javeriana, Fac Med, Dept Clin Epidemiol & Biostat, Carrera 7 40 62, Bogota, Colombia