1. From Diagnósticos da America (DASA), Rio de Janeiro, Brazil (F.P.d.C., C.F.A.); Americas Serviços Médicos, Rio de Janeiro, Brazil (F.P.d.C.); and Division of Cardiology, Duke University Medical Center, Duke Medical Pavilion, 10 Medicine Circle, Room 1E63, DUMC 3934, Durham, NC 27710 (C.F.A.).