1. Postgraduate Program in Cardiology and Cardiovascular Sciences, School of Medicine Universidade Federal do Rio Grande do Sul (UFRGS) Porto Alegre RS Brazil
2. Cardiovascular Surgery Department Hospital de Clínicas de Porto Alegre (HCPA) Porto Alegre RS Brazil
3. School of Medicine Universidade Federal do Rio Grande do Sul Porto Alegre RS Brazil
4. Department of Internal Medicine Hospital Nossa Senhora da Conceição Porto Alegre Brazil