Anne H Cross1, Dean M Wingerchuk2, Brian G Weinshenker2. 1. From the Department of Neurology (A.H.C.), Washington University School of Medicine, St. Louis, MO; the Department of Neurology (D.M.W.), Mayo Clinic, Scottsdale, AZ; and the Department of Neurology (B.G.W.), Mayo Clinic, Rochester, MN. crossa@neuro.wustl.edu. 2. From the Department of Neurology (A.H.C.), Washington University School of Medicine, St. Louis, MO; the Department of Neurology (D.M.W.), Mayo Clinic, Scottsdale, AZ; and the Department of Neurology (B.G.W.), Mayo Clinic, Rochester, MN.