[1] UMass Mem Hlth Care, Dept Neurol, Worcester, MA 01605 USA
[2] Univ Massachusetts, Sch Med, Dept Neurol, Worcester, MA USA
[3] Univ Massachusetts, Sch Med, Dept Pathol, Worcester, MA 01605 USA
[4] Massachusetts Gen Hosp, Dept Pathol, Div Neuropathol, Boston, MA 02114 USA
[5] Harvard Univ, Sch Med, Dept Pathol, Cambridge, MA 02138 USA