1. From the Inserm U1171, Degenerative and Vascular Cognitive Disorders, Université de Lille, CHU Lille, France (C.C.)
2. Department of Clinical Neurosciences, Radiology and Community Health Sciences, Hotchkiss Brain Institute, University of Calgary, AB, Canada (S.B.C.)
3. Department of Neurology, University of Virginia School of Medicine, Charlottesville, VA (K.C.J.)
4. J. Philip Kistler Stroke Research Center, Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Boston, MA (N.S.R.).