1. From the Duke Clinical Research Institute (T.S.W., C.B.P., A.F.H.) and Department of Medicine (T.S.W., A.S.H., C.B.P., J.A.E., A.F.H.), Duke University Medical Center, Durham, NC; Division of Cardiology, Manankowski Alberta Heart Institute, Alberta, Canada (J.A.E.); and UCLA Division of Cardiology, University of California at Los Angeles Medical Center, (G.C.F.).