BMJ 2019; 366 doi: https://doi.org/10.1136/bmj.l4774 (Published 30 July 2019)
Cite this as: BMJ 2019;366:l4774
BMJ 2020; 369 doi: https://doi.org/10.1136/bmj.m1595 (Published 28 April 2020)
Cite this as: BMJ 2020;369:m1595
https://bmjopen.bmj.com/content/10/1/e031765
Nicola McKinley et al