1 From the Department of Neurology (J.I.S.), Mayo Clinic, Phoenix, AZ; and Department of Neurology (E.T.P.), Mayo Clinic, Rochester, MN. sirven.joseph@mayo.edu.
2 From the Department of Neurology (J.I.S.), Mayo Clinic, Phoenix, AZ; and Department of Neurology (E.T.P.), Mayo Clinic, Rochester, MN.