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. 2015 Aug 11;3:292. Originally published 2014 Dec 1. [Version 2] doi: 10.12688/f1000research.5775.2

PMC4566288.1; 2014 Dec 1
PMC4566288.2; 2015 Aug 11

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Copyright: © 2015 Xu Q et al.

This is an open access article distributed under the terms of the Creative Commons Attribution Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure S1. — Criteria A and B were used to calculate the proportions in the 5-year periods 1993–1997, 1998–2002, 2003–2007, and 2008–2012. The total world publications (reviews excluded) were obtained by searches without any specification in the affiliation field. The total world publications (reviews excluded) with the country name in the affiliation field were obtained by summing the numbers of publications (reviews excluded) of all countries of the world.