Dalal Hasnain M, Doherty Patrick, Taylor Rod S
University of Exeter Medical School (primary care), Truro Campus, Knowledge Spa, Royal Cornwall Hospital, Truro TR1 3HD, UK
Department of Health Sciences, University of York, York YO10 5DD, UK.
BMJ. 2015 Sep 29;351:h5000. doi: 10.1136/bmj.h5000.