[1] Mem Hosp Rhode Isl, Neurol Dept, Pawtucket, RI 02860 USA
[2] Brown Univ, Sch Med, Clin Neurosci Dept, Providence, RI USA
[3] State Rhode Isl Med Examiners Off, Providence, RI USA
[4] Rhode Isl Hosp, Dept Pathol, Providence, RI 02903 USA
[5] Rhode Isl Hosp, Dept Clin Neurosci Neurosurg, Providence, RI 02903 USA