. 2018 Oct 29;23(1):1537430. doi: 10.1080/10872981.2018.1537430
© 2018 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Figure 1.
Schematic PRISMA diagram showing the literature selection process.