1. Instituto de Tratamento do Câncer Infantil (ITACI)Instituto da CriançaHospital das ClínicasFaculdade de MedicinaUniversidade de São Paulo São Paulo São Paulo Brazil
2. Pediatric Hematology Oncology UnitAdvanced Pediatric CenterPostgraduate Institute of Medical Education and Research Chandigarh India
3. Pediatric Oncology UnitDepartment of PediatricsSteve Biko Academic Hospital and University of Pretoria Pretoria South Africa