. 2013 Sep 4;11:32. doi: 10.1186/1478-4505-11-32
Copyright © 2013 Wilson 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 2.
Publication dates for documents.