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. 2016 Oct 24;11(10):e0165244. doi: 10.1371/journal.pone.0165244

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© 2016 Szentesi 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 credited.

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Fig 7 — A. Average impact factor by number of centres and nations. Both multicentre and multinational approaches increase the impact of the papers. *: p = 0.009 vs. single centre single nation; **: p˂0.001 vs single centre/single nation; ***: p˂0.001 vs 2–5 centres/2–5 nations and vs multicentre/single nation; ****: p˂0.001 vs all groups. Values are expressed as means ± standard error (S.E.M.) B. The share of average impact factor categories. There is a strong correlation between the number of countries per study and the quality of the article.