Allen Luke N, Barkley Shannon, De Maeseneer Jan, van Weel Chris, Kluge Hans, de Wit Niek, Greenhalgh Trisha
Nuffield Department of Primary Care Health Sciences, University of Oxford, UK
Primary Healthcare Services, WHO, Geneva.
BMJ. 2018 Oct 24;363:k4469. doi: 10.1136/bmj.k4469.