. 2018 Nov 1;3(11):574–583. doi: 10.1302/2058-5241.3.180023
© 2018 The author(s)
This article is distributed under the terms of the Creative Commons Attribution-Non Commercial 4.0 International (CC BY-NC 4.0) licence (https://creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed.
Fig. 1.
PRISMA 2009 flow diagram.