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. 2011 Mar 8;6(3):e17684. doi: 10.1371/journal.pone.0017684

Figure 2. Collaborative status of US articles.

Figure 2

Of the 3176 papers generated by the US, 15.6% (494) were international-corresponding (Intl-C), 11.5% (366) were international-secondary (Intl-S), and 72.9% (2316) were independent papers (Indep).