1. Program in Cardiology, School of Medicine, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil;
2. Cardiology Division, Hospital de Clínicas de Porto Alegre (HCPA), Porto Alegre, RS, Brazil;
3. Program in Medical Sciences, School of Medicine, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil;
4. Department of Medicine, School of Medicine, UFRGS, Porto Alegre, RS, Brazil