1. From the Department of Cardiology (P.K., T.G., P.A.D., C.P.A., F.C.V.), the Laboratory of Physiology (W.J.P.), and the Department of Nuclear Medicine & PET Research (A.A.L.), VU University Medical Center, Institute for Cardiovascular Research, Amsterdam, The Netherlands, and the Turku PET Center (J.K.), University of Turku, Turku, Finland.