1. Cardiology Division, Hospital de Clínicas de Porto Alegre , Ramiro Barcelos, 2350 - Santa Cecília, Porto Alegre - RS, 90035-903 , Brazil
2. Postgradute Program in Cardiology and Cardiovascular Sciences, Universidade Federal do Rio Grande do Sul (UFRGS) , Porto Alegre - RS, 90035-903 , Brazil
3. Cardiovascular Division, Hospital Moinhos de Vento , Porto Alegre - RS, 90035-000 , Brazil