. 2020 Oct 3;50(1):105–112. doi: 10.1093/ageing/afaa183
© The Author(s) 2020. Published by Oxford University Press on behalf of the British Geriatrics Society.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com
Figure 1.
PRISMA flow diagram.