1. Newcastle University; Institute of Health and Society; Richardson Road Newcastle upon Tyne UK NE2 4AX
2. University College London; Research Department of Clinical, Educational and Health Psychology; 1-19 Torrington Place London UK WC1E 7HB
3. University of Bristol; Population Health Sciences, Bristol Medical School; 39 Whatley Road Bristol UK BS8 2PS
4. King's College London; Primary Care & Public Health Sciences; Addison House, Guy's campus London UK SE1 1UL
5. University of Bristol; School of Social and Community Medicine; 39 Whatley Road Bristol UK BS8 2PS