. 2019 May 17;22(5):863–873. doi: 10.1111/hex.12916
© 2019 The Authors Health Expectations published by John Wiley & Sons Ltd
This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Figure 1.
PRISMA flow diagram