. 2006 Dec 5;3:101. doi: 10.1186/1743-422X-3-101
Copyright © 2006 Howard 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.