About the Authors

Paul Mathews

pmathews@essex.ac.uk

Affiliation Institute of Social and Economic Research, University of Essex, Colchester, United Kingdom

Rebecca Sear

Affiliation Department of Population Health, London School of Hygiene and Tropical Medicine, London, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: PM RS. Analyzed the data: PM. Wrote the paper: PM RS.