1. From the Department of Radiology (J.H.), University Medical Center Utrecht, The Netherlands; the Departments of Neuroradiology (E.T.P., A.C., S.M.C., X.G.) and Neurology (N.V.), National Neuroscience Institute, Singapore; CFIN, the Department of Neuroradiology (E.T.P.), Aarhus University Hospital, Aarhus, Denmark; and the Laboratory of Molecular Imaging (X.G.), Singapore Bioimaging Consortium, Singapore.