. 2014 Jun 12;14:78. doi: 10.1186/1471-2415-14-78
Copyright © 2014 Dawson et al.; licensee BioMed Central Ltd.
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 credited.
Figure 1.
Flowchart for how articles were chosen for inclusion.