About the Authors

Ellen Wright

ellen.wright@kcl.ac.uk

Affiliation Department of Primary Care and Public Health Sciences, King's College London, London, United Kingdom

Peter T. Schofield

Affiliation Department of Primary Care and Public Health Sciences, King's College London, London, United Kingdom

Paul Seed

Affiliation Department of Primary Care and Public Health Sciences, King's College London, London, United Kingdom

Mariam Molokhia

Affiliation Department of Primary Care and Public Health Sciences, King's College London, London, United Kingdom

Competing Interests

MM has received grants from AstraZeneca and Pfizer and from the Serious Adverse Events Consortium (collaboration of academia & industry) for studies of adverse drug reactions.This does not alter the authors′ adherence to all the PLOS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: EW PS. Performed the experiments: EW PS PTS. Analyzed the data: PTS PS. Contributed reagents/materials/analysis tools: PTS. Wrote the paper: EW. Data interpretation: MM EW PTS. Revised article critically for important intellectual content: MM. Original hypothesis and study design: EW. Literature search: EW. Final manuscript editing: EW. Contributions to final manuscript: PS PTS.