. 2009 Feb 19;28(1):22. doi: 10.1186/1756-9966-28-22
Copyright © 2009 Yamashita 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.