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. 2016 Oct 27;1(3):e000114. doi: 10.1136/bmjgh-2016-000114

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Relationship between gross national income and number of medicines that are included both in the WHO and national Model Lists of Essential Medicines (EMLs) for each of the 25 countries included in the analysis. Spearman Rank Correlation Coefficient (r) 0.57 (95% CI 0.23 to 0.79), p<0.01.