[1] UNIV NEWCASTLE UPON TYNE, DEPT NEUROL, NEWCASTLE UPON TYNE NE1 7RU, TYNE & WEAR, ENGLAND
[2] UNIV NEWCASTLE UPON TYNE, DEPT PHARMACOL SCI, NEWCASTLE UPON TYNE NE1 7RU, TYNE & WEAR, ENGLAND
[3] UNIV NEWCASTLE UPON TYNE, DEPT CHILD HLTH, NEWCASTLE UPON TYNE NE1 7RU, TYNE & WEAR, ENGLAND
[4] UNIV MARBURG, BIOCHEM FACHBEREICH CHEM, D-3550 MARBURG, FED REP GER
[5] ROYAL HOSP SICK CHILDREN, FRASER ALLANDER UNIT PAEDIAT NEUROL, GLASGOW G3 8SJ, SCOTLAND