1. Centre for Health Care Research, Post Graduate Medical School, University of Brighton, Mayfield House, Falmer, Brighton BN1 9PH, UK
2. The Elton John Unit, Brighton General Hospital, Elm Grove, Brighton BN2 3EU, UK
3. Centre for Health Care Research, Post Graduate Medical School, University of Brighton, Mayfield House, Falmer, Brighton BN1 9PH
4. Psychology Unit, 5th Floor, Thomas Guy House, Guy's Campus, London SE1 9RT, UK