Kandala Ngianga-Bakwin, Connock Martin, Pulikottil-Jacob Ruth, Mistry Hema, Sutcliffe Paul, Costa Matthew, Clarke Aileen
Warwick Evidence, Warwick Medical School, University of Warwick, Coventry CV4 7AL, UK.
BMJ. 2014 Feb 19;348:g1506. doi: 10.1136/bmj.g1506.