1. Centro de Pesquisas Clínicas do Centro Universitário Cesmac/Hospital do Coração de Alagoas, Maceió, AL
2. Pronto Socorro Cardiológico de Pernambuco (PROCAPE), University of Pernambuco
3. UNICAP Clinical Research Institute, Recife, PE
4. School of Medical Sciences of Minas Gerais, Fundação Educacional Lucas Machado, Belo Horizonte
5. Department of Internal Medicine, School of Medical Sciences, State University of Campinas, São Paulo, Brazil