. 2014 May 15;2014:687978. doi: 10.1155/2014/687978
Copyright © 2014 Fabio Bertapelli et al.
This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Figure 1.
Flowchart of the study selection process.