[1] UNIV SURREY,DEPT PSYCHOL,GUILDFORD GU2 5XH,SURREY,ENGLAND
[2] CITY & HACKNEY HLTH AUTHOR,DEPT COMMUNITY MED,LONDON,ENGLAND
[3] ST LEONARDS HOSP,CITY & HACKNEY HLTH AUTHOR,DEPT COMMUNITY MED,LONDON N1,ENGLAND
[4] UNIV LONDON LONDON SCH HYG & TROP MED,DEPT COMMUNITY HLTH,LONDON WC1E 7HT,ENGLAND
[5] UNIV SURREY,DEPT PSYCHOL,GUILDFORD GU2 5XH,SURREY,ENGLAND