[1] WALTON HOSP,MERSEY REG DEPT MED & SURG NEUROL,LIVERPOOL L9 1AE,MERSEYSIDE,ENGLAND
[2] SO GEN HOSP,INST NEUROL SCI,GLASGOW G51 4TF,SCOTLAND
[3] UNIV NOTTINGHAM,DEPT MATH,NOTTINGHAM NG7 1RD,ENGLAND
[4] UNIV GLASGOW,DEPT SURG,MED STAT UNIT,GLASGOW G11 6NT,SCOTLAND
[5] CHARING CROSS HOSP,REG NEUROSCI CTR,LONDON W6 8RF,ENGLAND