Waqar Salman, Mughal Faraz, Rashid Ahmed, Mant Jonathan
Department of Public Health and Primary Care, Imperial College London W6 8RP, UK
Warwick Primary Care, Division of Health Sciences, Warwick Medical School, University of Warwick, Coventry, UK.
BMJ. 2016 Jun 13;353:i3022. doi: 10.1136/bmj.i3022.