[1] HAMMERSMITH HOSP,ROYAL POSTGRAD MED SCH,DEPT DIAGNOST RADIOL,LONDON W12 0HS,ENGLAND
[2] INST NEUROL,LONDON WC1N 3BG,ENGLAND
[3] NATL HOSP,LONDON WC1N 3BG,ENGLAND
[4] HAMMERSMITH HOSP,ROYAL POSTGRAD MED SCH,DEPT MED NEUROL,LONDON W12 0HS,ENGLAND
[5] PICKER INTL,WEMBLEY,LONDON,ENGLAND