1. Paediatric Rheumatology Unit of the Children’s Institute, Hospital das Clínicas, University of São Paulo Medical School, São Paulo, Brazil,
2. University of São Paulo Medical School, São Paulo, Brazil
3. Haematology Unit of Hospital das Clínicas, University of São Paulo Medical School, São Paulo, Brazil
4. Paediatric Rheumatology Unit of the Children’s Institute, Hospital das Clínicas, University of São Paulo Medical School, São Paulo, Brazil