. 2013 Dec 20;8:18. doi: 10.1186/1746-4358-8-18
Copyright © 2013 Keemer; 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 1.
Response rate, parity and reasons for exclusion.