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These are US based authors, but are they actually American or other nationalities? That would be an interesting breakdown. And lets not let journals from other countries get off the hook, they publish fake stuff and duplicative research. They just don't retract it.
No GR it's only americans... deal with it!
Was there no normalization here? Could it just be that the US has more institutions publishing in "pubmed"-able journals and therefore shares a greater total number of fraud cases but not necessarily a greater percentage.
Does the study include a breakdown of each nationality's representative percentage in set: "all papers on PubMed between 2000 and 2010"?
If the study doesn't include that, Alanis Morissette could learn a lot about irony here.
I second Brian's thoughts.
Good review of the paper behind this article: