[1] UNIV FREIBURG,DEPT CLIN NEUROL & NEUROPHYSIOL,NEUROCHEM LAB,HANSASTR 9,D-7800 FREIBURG,FED REP GER
[2] UNIV LONDON KINGS COLL,DEPT NEUROL,MRC,MOVEMENT DISORDER RES GRP,LONDON WC2R 2LS,ENGLAND
[3] INST PSYCHIAT,PARKINSONS DIS SOC RES CTR,LONDON SE5 8AF,ENGLAND
[4] UNIV LONDON KINGS COLL HOSP,SCH MED,LONDON SE5 8RX,ENGLAND