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. 2013 Dec 31;8(12):e83440. doi: 10.1371/journal.pone.0083440

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© 2013 Huffman et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Country-level fractional counts (scale: 0–1) against logarithmic annual citation counts (country-level cardiovascular research output) with color coding representing World Bank country income status. Fractional counts represent the proportion of each country's authors against the total number of authors on each publication. The size of each country's bubble represents the population size of that country. Average citation index (ACI) is calculated by dividing a publication's total citations five years post-publication by five.