1. From the Philips Research North America (A.M.N.), Briarcliff Manor, NY; Division of Cardiology (A.M.N., J.A.G., J.C.M., M.S.K., A.J.P.K., J.D.C.), University of Colorado Denver, Denver, Colo; Division of Cardiology (J.A.G.), Denver Health Medical Center, Denver, Colo; Philips Technologie GmbH Forschungslaboratorien (E.H., M.G.), Hamburg, Germany; and Cardiovascular Innovation (G.A.F.S.), Philips Healthcare, Best, Netherlands.