1. Support Group for Children and Adolescents with Cancer (GRAACC), Pediatric Oncology Institute (IOP), Federal University of Sao Paulo (UNIFESP/EPM), Sao Paulo, Brazil.
2. Department of Clinical and Experimental Oncology, Discipline of Hematology and Hemotherapy, Federal University of Sao Paulo (UNIFESP/EPM), Sao Paulo, Brazil.
3. Department of Pediatrics, Discipline of Pediatric Oncology, Federal University of Sao Paulo (UNIFESP/EPM), Sao Paulo, Brazil.