About the Authors

Caroline Free
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

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

Leandro Galli
Warwick University, Coventry, 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 PE GP VP. Performed the experiments: GP LW LG LF CF PE. Analyzed the data: LW. Contributed reagents/materials/analysis tools: GP. Wrote the first draft of the manuscript: CF. Contributed to the writing of the manuscript: CF AH PE GP LW LG LF VP. ICMJE criteria for authorship read and met: CF AH PE GP LW LG LF VP. Agree with manuscript results and conclusions: CF AH PE GP LW LG LF VP.