About the Authors

Trisha Greenhalgh


Affiliation Healthcare Innovation and Policy Unit, Centre for Health Sciences, Barts and The London School of Medicine and Dentistry, London, United Kingdom

Jill Russell

Affiliation Division of Medical Education, University College London, London, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

ICMJE criteria for authorship read and met: TG JR. Agree with the manuscript's results and conclusions: TG JR. Wrote the first draft of the paper: TG. Contributed to the writing of the paper: TG JR.