1. Psychology Applied to Health Group; Institute of Health Research; University of Exeter Medical School; Exeter UK
2. School of Health Sciences; Centre for Applied Vision Research; City University of London
3. School of Health Sciences; Centre for Health Services Research; City University of London
4. Centre for Behaviour Change; University College London; London UK
5. School of Medicine; University of St Andrews; St Andrews UK
6. Clinical Epidemiology Programme; Ottawa Hospital Research Institute
7. Department of Medicine; University of Ottawa; Ottawa Canada
8. Department of Family and Community Medicine; Women's College Hospital - University of Toronto; Toronto Canada
9. School of Epidemiology; Public Health and Preventive Medicine; University of Ottawa; Ottawa Canada
10. Institute of Health and Society; Health Economics Group; Newcastle University; Newcastle upon Tyne UK
11. School of Medicine; Dentistry and Biomedical Sciences; Queens University of Belfast; UK
12. Department of Primary Care and Public Health Sciences; King's College London; UK