[1] UNIV LONDON,DEPT NEUROL,MRC,MOVEMENT DISORDERS RES GRP,DENMARK HILL,LONDON SE5 8AF,ENGLAND
[2] INST PSYCHIAT,PARKINSONS DIS SOC RES CTR,LONDON SE5 8AF,ENGLAND
[3] UNIV LONDON KINGS COLL HOSP,SCH MED,LONDON SE5 8RX,ENGLAND
[4] HOP SALPETRIERE,INSERM,U289,MED EXPTL LAB,F-75651 PARIS 13,FRANCE
[5] UNIV LONDON,NATL HOSP NERVOUS DIS,DEPT CLIN NEUROL,LONDON,ENGLAND