About the Authors

Adam J. Streeter

Roles Formal analysis, Writing – original draft

streeter@exchange.wwu.de

Affiliations Institute for Epidemiology and Social Medicine, University of Münster, Münster, North Rhine-Westphalia, Germany, Medical Statistics, Faculty of Health, University of Plymouth, Plymouth, United Kingdom, Institute for Health Research, University of Exeter Medical School, University of Exeter, Exeter, United Kingdom

Lauren R. Rodgers

Roles Writing – review & editing

Affiliation Institute for Health Research, University of Exeter Medical School, University of Exeter, Exeter, United Kingdom

Jane Masoli

Roles Investigation, Writing – review & editing

Affiliation Institute for Health Research, University of Exeter Medical School, University of Exeter, Exeter, United Kingdom

Nan X. Lin

Roles Methodology, Writing – review & editing

Affiliation Department of Mathematics, Physics and Electrical Engineering, Northumbria University, Newcastle upon Tyne, United Kingdom

Alessandro Blé

Roles Data curation, Writing – review & editing

Affiliation Institute for Health Research, University of Exeter Medical School, University of Exeter, Exeter, United Kingdom

Willie Hamilton

Roles Writing – review & editing

Affiliation Institute for Health Research, University of Exeter Medical School, University of Exeter, Exeter, United Kingdom

William E. Henley

Roles Methodology, Supervision, Writing – review & editing

Affiliation Institute for Health Research, University of Exeter Medical School, University of Exeter, Exeter, United Kingdom

Competing Interests

Further to the competing interests section, Alessandro Blé has since joined Glaxo-Smith Kline and so “Alessandro Blé is currently an employee of Glaxo-Smith Kline (GSK) and declares that GSK had neither a role nor influence in the study design, data collection, preparation of the manuscript or decision to publish. The authors have no other potentially competing interests to declare. There are no patents, products in development or marketed products associated with this research to declare. This does not alter our adherence to PLOS ONE policies on sharing data and materials.