. 2012 May 6;10:15. doi: 10.1186/1478-4505-10-15
Copyright ©2012 El-Jardali 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 .
Multi- staged study approach.