About the Authors

Pat Sturdy

Affiliation Centre for Primary Care and Public Health, Blizard Institute, Barts and The London Medical School, London, United Kingdom

Stephen Bremner

Affiliation Centre for Primary Care and Public Health, Blizard Institute, Barts and The London Medical School, London, United Kingdom

Gill Harper

Affiliation Faculty of Actuarial Science and Statistics, Cass Business School, City University, London, United Kingdom

Les Mayhew

Affiliation Faculty of Actuarial Science and Statistics, Cass Business School, City University, London, United Kingdom

Sandra Eldridge

Affiliation Centre for Primary Care and Public Health, Blizard Institute, Barts and The London Medical School, London, United Kingdom

John Eversley

Affiliation Department of Public Health Primary Care and Food Policy, Community and Health Sciences, City University, London, United Kingdom

Aziz Sheikh

Affiliation Centre for Population Health Sciences: GP Section, University of Edinburgh, Edinburgh, United Kingdom

Susan Hunter

Affiliation Centre for Primary Care and Public Health, Blizard Institute, Barts and The London Medical School, London, United Kingdom

Kambiz Boomla

Affiliation Centre for Primary Care and Public Health, Blizard Institute, Barts and The London Medical School, London, United Kingdom

Gene Feder

Affiliation Academic Unit of Primary Health Care, University of Bristol, Bristol, United Kingdom

Keith Prescott

Affiliation Centre for Primary Care and Public Health, Blizard Institute, Barts and The London Medical School, London, United Kingdom

Chris Griffiths

c.j.griffiths@qmul.ac.uk

Affiliation Centre for Primary Care and Public Health, Blizard Institute, Barts and The London Medical School, London, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: CG PS SE SB GH GF AS LM KB JE. Performed the experiments: CG PS SE SB GH GF AS LM KB JE SH KP. Analyzed the data: SE SB GH LM KB SH. Contributed reagents/materials/analysis tools: CG PS SE SB GH GF AS LM KB JE SH KP. Wrote the paper: CG PS SE SB GH GF AS LM KB JE SH KP.