1. Institute of Psychiatry; Health Service and Population Research Department; King's College London De Crespigney Park London UK SE5 8AF
2. Edge Hill University; Faculty of Health and Social Care; St Helen's Road Ormskirk Lancashire UK L39 4QP
3. University of Manchester; Biostatistics, Health Sciences-Methodology; School of Community Based Medicine Jean McFarlane Building, Oxford Road Manchester UK M13 9PL
4. King's College London; Florence Nightingale School of Nursing and Midwifery; 2.25, James Clerk Maxwell Building 57 Waterloo Road London UK SE1 8WA
5. Cornwall Partnership NHS Foundation Trust and Peninsula College of Medicine and Dentistry; Mental Health Research Group; Veysey Building Exeter UK
6. King's College London; Health Service and Population Research Department, Institute of Psychiatry; De Crespigny Park Denmark Hill London UK SE5 8AF