Barry Eleanor, Roberts Samantha, Finer Sarah, Vijayaraghavan Shanti, Greenhalgh Trisha
Nuffield Department of Primary Care Health Sciences, University of Oxford, Oxford OX2 6GG, UK.
Blizard Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, UK.
BMJ. 2015 Sep 7;351:h4717. doi: 10.1136/bmj.h4717.