About the Authors

Sarah Burkill

sarah.burkill@ki.se

Affiliations Research Department of Infection and Population Health, University College London, London, United Kingdom, Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden

Andrew Copas

Affiliation Research Department of Infection and Population Health, University College London, London, United Kingdom

Mick P. Couper

Affiliation Institute for Social Research, University of Michigan, Ann Arbor, United States of America

Soazig Clifton

Affiliation Research Department of Infection and Population Health, University College London, London, United Kingdom

Philip Prah

Affiliation Research Department of Infection and Population Health, University College London, London, United Kingdom

Jessica Datta

Affiliation Department of Social and Environmental Research, London School of Hygiene and Tropical Medicine, London, England

Frederick Conrad

Affiliation Institute for Social Research, University of Michigan, Ann Arbor, United States of America

Kaye Wellings

Affiliation Department of Social and Environmental Research, London School of Hygiene and Tropical Medicine, London, England

Anne M. Johnson

Affiliation Research Department of Infection and Population Health, University College London, London, United Kingdom

Bob Erens

Affiliations Research Department of Infection and Population Health, University College London, London, United Kingdom, Department of Health Services Research & Policy, London School of Hygiene and Tropical Medicine, London, England

Competing Interests

The authors have read the journal's policy and the authors of this manuscript have the following competing interests: AMJ has been a Governor of the Wellcome Trust since 2011. The other authors declare that they have no conflicts of interest. This does not alter the authors’ adherence to PLOS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: BE AC MPC FC AMJ. Performed the experiments: BE SC. Analyzed the data: SB AC PP SC MPC AMJ BE. Wrote the paper: SB AC MPC SC PP JD FC KW AMJ BE.