. 2009 Jul 24;4:20. doi: 10.1186/1745-6673-4-20
Copyright © 2009 Sawanyawisuth 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 chart showed enrollment process.