. 2011 Dec 28;9:139. doi: 10.1186/1741-7015-9-139
Copyright ©2011 Ohle 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 cited.
Figure 3.
Summary of quality assessment of included studies.