. 2015 Nov 4;9:5925–5932. doi: 10.2147/DDDT.S91217
© 2015 Fan et al. This work is published by Dove Medical Press Limited, and licensed under Creative Commons Attribution – Non Commercial (unported, v3.0) License
The full terms of the License are available at http://creativecommons.org/licenses/by-nc/3.0/. Non-commercial uses of the work are permitted without any further permission from Dove Medical Press Limited, provided the work is properly attributed.
Figure 1.
Search strategy and flow chart for this meta-analysis.