. 2009 Dec 16;7(Suppl 1):S5. doi: 10.1186/1478-4505-7-S1-S5
Copyright ©2009 Lavis 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.
Clarifying evidence needs.