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.