. 2013 Aug 6;11:25. doi: 10.1186/1478-4505-11-25
Copyright © 2013 World Health Organization; licensee BioMed Central Ltd.
This is an Open Access article in the spirit of the BioMed Central Open Access Charter http://www.biomedcentral.com/info/about/charter/, without any waiver of WHO¿s privileges and immunities under international law, convention or agreement. This article should not be reproduced for use in association with the promotion of commercial products, services or any legal entity. There should be no suggestion that WHO endorses any specific organisation or products. The use of the WHO logo is not permitted. This notice should be preserved along with the article's original URL.
Figure 2.
Conceptual framework.