. 2007 Sep 14;7:15. doi: 10.1186/1471-227X-7-15
Copyright © 2007 Schiebel and Ebbert; 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.
Study Flowchart.