1. Department of Psychiatry and Psychology; Maastricht University Medical Centre; P.O. Box 616 (DOT12) 6200 MD Maastricht The Netherlands
2. King's College London, King's Health Partners, Department of Psychosis Studies, Institute of Psychiatry; London UK
3. King's College London, King's Health Partners, Centre for Epidemiology and Public Health, Health Service and Population Research Department, Institute of Psychiatry, Psychology & Neuroscience; London UK