[1] RADCLIFFE INFIRM,DEPT CLIN NEUROL,OXFORD OX2 6HE,ENGLAND
[2] ADDENBROOKES HOSP,PARKE DAVIS NEUROSCI RES CTR,CAMBRIDGE,ENGLAND
[3] JOHN RADCLIFFE HOSP,CTR MAGNET RESONANCE IMAGING,DEPT RADIOL,OXFORD OX3 9DU,ENGLAND
[4] WESTERN GEN HOSP,NATL HLTH SERV TRUST,DEPT CLIN NEUROSCI,EDINBURGH EH4 2XU,MIDLOTHIAN,SCOTLAND