1 From the Department of Neurology (D.S.K.), Mayo Clinic, Rochester MN; and School of Public Health and Helen Wills Neuroscience Institute (W.J.J.), University of California Berkeley. knopman@mayo.edu.
2 From the Department of Neurology (D.S.K.), Mayo Clinic, Rochester MN; and School of Public Health and Helen Wills Neuroscience Institute (W.J.J.), University of California Berkeley.