1. Centro Infantil Boldrini, Campinas, Brazil;
2. Graduate Program in Genetics and Molecular Biology, Biology Institute, State University of Capinas;
3. Departamento de Clínica Médica;
4. Centro Integrado de Pesquisas Oncohematológicas na Infância, and
5. Departamento de Genética Médica, Faculty of Medical Sciences, State University of Campinas, Campinas, Brazil