[1] Hosp Clin Porto Alegre, Div Cardiol, BR-90035903 Porto Alegre, RS, Brazil
[2] Hosp Clin Porto Alegre, Natl Inst Sci & Technol Hlth Technol Assessment, IATS CNPq, Ctr Pesquisa Clin, BR-90035903 Porto Alegre, RS, Brazil
[3] Univ Fed Rio Grande do Sul, Sch Med, Postgrad Studies Program Cardiol, Porto Alegre, RS, Brazil
[4] Univ Toronto, Mt Sinai Hosp, Div Cardiol, Univ Hlth Network, Toronto, ON M5G 1X5, Canada