1. Cardiovascular Medicine Division, Department of Medicine, Beth Israel Deaconess Medical Center, Boston, MA 02215, USA
2. Faculdade de Medicina da Universidade de São Paulo, Avenida Doutor Arnaldo, 255, São Paulo, SP, 05430-000, Brazil
3. Harvard Medical School, 25 Shattuck Street, Boston, MA, 02115, USA