. 2015 Apr 15;4:179. doi: 10.1186/s40064-015-0941-7
© Xia et al.; licensee Springer. 2015
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 credited.
Figure 1.
The flowchart of the selection process.