[1] Hosp Ninos Luis Calvo Mackenna, Pediat Oncol, Santiago, Chile
[2] Hosp Clin Porto Alegre, Pediat Oncol, Porto Alegre, RS, Brazil
[3] Hosp Pediat SAMIC Prof Dr Juan Garrahan, Pediat Oncol, Buenos Aires, DF, Argentina
[4] Hosp Amor de Barretos, Pediat Oncol, Barretos, Brazil
[5] Inst Oncol Pediat, Pediat Oncol, Sao Paulo, Brazil
[6] Ctr Hematooncol Pediat, Pediat Oncol, Montevideo, Uruguay
[7] Hosp Crianca Santo Antonio, Pediat Oncol, Porto Alegre, RS, Brazil
[8] Hosp Sao Marcos, Assoc Piauiense Combate Canc, Pediat Oncol, Teresina, Brazil
[9] Hosp San Borja Arriaran, Pediat Oncol, Santiago, Chile
[10] Hosp San Juan Dios, Pediat Oncol, Santiago, Chile
[11] Hosp Infantil Joana de Gusmao, Pediat Oncol, Florianopolis, SC, Brazil
[12] Inst Canc Infantil, Pediat Oncol, Porto Alegre, RS, Brazil