1. From the Division of Cardiology (J.L.J., Q.A.T., A.A.M.), the Cardiac MR PET CT Program, Department of Radiology (F.B., Q.A.T., J.H.N., C.L.S., U.H.), the Biostatistics Center (H.L.), and Department of Emergency Medicine (J.T.N.), Massachusetts General Hospital, Boston, Mass; and the Department of Internal Medicine II and Cardiology (M.K., W.K.), University of Ulm Medical Center, Ulm, Germany.