1 From the Neurology Service (M.D.-A., J.R.), Sierrallana Hospital-IDIVAL; Department of Medicine and Psychiatry (M.D.-A., J.R.), University of Cantabria, Torrelavega; Nuclear Medicine Service (A.G.-G.), Molecular Imaging Group, University Hospital Marqués de Valdecilla-IDIVAL; Radiology Service Sierrallana Hospital (S.M.-L.), Torrelavega; and Network Center for Biomedical Research in Neurodegenerative Diseases (CIBERNED) (J.R.), Spain.