Key points are not available for this paper at this time.
This article was published in BMJ Global Health by BMJ Journals © Author(s) (or their employer(s)) 2021. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ. and the definite version is available at: http://dx.doi.org/10.1136/bmjgh-2020-004671 The Journal's website is at: https://gh.bmj.com/content/6/1/e004671
Dash et al. (Fri,) studied this question.