1. Division of Cardiovascular Medicine, Radcliffe Department of Medicine, University of Oxford Centre for Clinical Magnetic Resonance Research, United Kingdom (V.M.S., A.T.H., C.T.R., M.M.B., S.G.M., S.N.).
2. Wolfson Brain Imaging Centre, University of Cambridge, United Kingdom (C.T.R.).
3. Division of Cardiovascular Medicine, Department of Medical and Health Sciences (P.D., T.E., C.-J.C.), Linköping University, Sweden.
4. Center for Medical Image Science and Visualization (P.D., T.E., C.-J.C.), Linköping University, Sweden.
5. Department of Clinical Physiology (C.-J.C.), Linköping University, Sweden.
6. Department of Medical and Health Sciences (C.-J.C.), Linköping University, Sweden.