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. 2010 Aug 16;5(8):e12203. doi: 10.1371/journal.pone.0012203

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This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

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The solid lines show the number of doctoral degrees granted by institutions in each region. In addition, the dashed line shows the number of doctoral degrees granted by the US institutions to the US citizens and permanent residents.