1. Department of Psychiatry, St. James's University Hospital, Leeds LS9 7TF
2. 7 Hungerford Road, Huddersfield HD3 3AL
3. Department of Psychiatry, The General Hospital, Halifax HX3 OPW
4. Department of General Psychiatry and Psychogeriatrics, De La Pole Hospital, Willerby, Hull HU10 6ED
5. Department of Psychiatry, Stanley Royd Hospital, Wakefield WF14 4DQ, UK
6. Astra Arcus AB, S-15185 Södertälje, Sweden
7. Department of Clinical Research, Astra Pharmaceuticals Ltd., Kings Langley WD4 8DH, UK