[1] Mayo Clin, Dept Neurosci & Neuropathol, Jacksonville, FL 32224 USA
[2] Mayo Clin, Dept Neurol, Rochester, MN USA
[3] Mayo Clin, Dept Lab Med, Rochester, MN USA
[4] Mayo Clin, Dept Pathol, Rochester, MN USA
[5] Istanbul Univ, Dept Neurol, Cerrahpasa Med Sch, Istanbul, Turkey