[1] UNIV HOSP ZURICH,DEPT NEUROPATHOL,CH-8091 ZURICH,SWITZERLAND
[2] HARVARD UNIV,SCH MED,DEPT ANESTHESIOL,BOSTON,MA 02115
[3] HAMMERSMITH HOSP,INST PSYCHIAT,DEPT NEUROPATHOL,LONDON W12 0HS,ENGLAND
[4] HAMMERSMITH HOSP,DEPT HISTOCHEM,LONDON W12 0HS,ENGLAND