. 2006 Sep 11;7:10. doi: 10.1186/1472-6939-7-10
Copyright © 2006 Holm and Williams-Jones; 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.
Web-linking according to in- and out-links.