1 Emergency Department, Children's Institute, Faculdade de Medicina da Universidade de Sao Paulo, Brazil.
2 Emergency Department, Children's Institute, Faculdade de Medicina da Universidade de Sao Paulo, Brazil; Hospital Israelita Albert Einstein, Sao Paulo, Brazil.
3 Emergency Department, Children's Institute, Faculdade de Medicina da Universidade de Sao Paulo, Brazil. Electronic address: [email protected].