From the Departments of Neurology (Drs. Josephs, Knopman, Boeve, and Petersen), Radiology Research (J.L. Whitwell), and Laboratory Medicine and Pathology (Dr. Parisi), Mayo Clinic, Rochester, MN; and Department of Pathology and Neuroscience (Dr. Dickson), Mayo Clinic, Jacksonville, FL. (At 2005-08-23)
