This commentary is on the systematic review by Mehra et al. To view this paper visit https://doi.org/10.1111/dmcn.14126.. To read the full article, log in using your NHS Athens details. To access full-text: click “Log in/Register” (top right hand side). Click ‘Institutional Login’ then select 'OpenAthens Federation', then ‘NHS England’. Enter your Athens details to view the article.