Sharples Jonathan M, Oxman Andrew D, Mahtani Kamal R, Chalmers Iain, Oliver Sandy, Collins Kevan, Austvoll-Dahlgren Astrid, Hoffmann Tammy
EPPI-Centre, UCL Department of Social Science, London, UK
Global Health Unit, Norwegian Institute of Public Health, Oslo, Norway.
BMJ. 2017 May 16;357:j2234. doi: 10.1136/bmj.j2234.