1. From the Department of Psychiatry and Neuropsychology, School for Mental Health and Neuroscience, Alzheimer Center Limburg, Maastricht University, the Netherlands (W.M.F., H.I.L.J.)
2. Department of Radiology and Nuclear Medicine, School for Mental Health and Neuroscience, Maastricht University Medical Center, the Netherlands (W.M.F., W.H.B.)
3. MassGeneral Institute for Neurodegenerative Disease (MIND), Massachusetts General Hospital, Charlestown (W.M.F., B.J.B., M.P.F., S.J.v.V.)
4. Department of Neurology, J. Philip Kistler Stroke Research Center (W.M.F., S.M.G., S.J.v.V.), Massachusetts General Hospital, Harvard Medical School, Boston.
5. C.S. Kubik Laboratory of Neuropathology, Department of Pathology, Massachusetts General Hospital, Boston (M.P.F.)
6. Division of Nuclear Medicine and Molecular Imaging, Department of Radiology (H.I.L.J.), Massachusetts General Hospital, Harvard Medical School, Boston.