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. 2013 Apr 8;13:308. doi: 10.1186/1471-2458-13-308

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Copyright © 2013 Fokam 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.

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Trends of EWIs from 2008–2010. EWI₁: Early Warning Indicator 1, EWI₂: Early Warning Indicator 2, EWI₃: Early Warning Indicator 3, EWI₄: Early Warning Indicator 4, EWI₅: Early Warning Indicator 5. For each EWI, the graphs represent the national performance in 2008, 2009, and 2010, respectively.