. 2012 Sep 11;2:18. doi: 10.1186/2191-1991-2-18
Copyright ©2012 Costa et al.; licensee Springer.
This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Figure 1.
Literature search and selection process.