1. King's College London; Institute of Psychiatry; Box PO 29, De Crespigny Park Denmark Hill London UK SE5 8AF
2. University College London; Department of Primary Care & Poulation Sciences,Royal Free & University College Medical School; The Holborn Union Building 2nd Floor, Archway Campus, 2nd Floor, Archway Campus, Highgate Hill London UK N19 3UA
3. Keele University; School of Medicine; Keele Newcatle-under-Lyme UK
4. Staffordshire University; Centre for Health Policy and Practice; Stafford UK