[1] UNIV MASSACHUSETTS, MED CTR, SCH MED, DEPT NEUROL, WORCESTER, MA 01655 USA
[2] NEW ENGLAND DEACONESS HOSP, DEPT PATHOL, BOSTON, MA 02215 USA
[3] HARVARD UNIV, SCH MED, BOSTON, MA 02115 USA
[4] HOP LA PITIE SALPETRIERE, LAB NEUROPATHOL RAYMOND ESCOUROLLE, PARIS, FRANCE