About the Authors

Caroline Free, Phil Edwards
Clinical Trials Unit, London School of Hygiene & Tropical Medicine, London, United Kingdom

Gemma Phillips
Department of Health Services Research and Policy, London School of Hygiene & Tropical Medicine, London, United Kingdom

Leandro Galli
Warwick University, Coventry, United Kingdom

Louise Watson, Vikram Patel, Andy Haines
Department of Population Health, London School of Hygiene & Tropical Medicine, London, United Kingdom

Lambert Felix
Department of Primary Care and Public Health, Imperial College, London, United Kingdom

Corresponding Author

caroline.free@lshtm.ac.uk

Competing Interests

VP is a member of the Editorial Board of PLOS Medicine. The authors have declared that no other competing interests exist.

Author Contributions

Conceived and designed the experiments: CF AH GP PE. Performed the experiments: GP LG LW FL PE CF. Analyzed the data: LW GP. Wrote the first draft of the manuscript: CF. Contributed to the writing of the manuscript: CF GP LW LG LF PE VP AH. ICMJE criteria for authorship read and met: CF GP LW LG LF PE VP AH. Agree with manuscript results and conclusions: CF GP LW LG LF PE VP AH. Wrote the database: GP.