. 2013 Jan 5;13:8. doi: 10.1186/1471-244X-13-8
Copyright ©2013 Matsuoka 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 1.
Flow diagram of the study.