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. 2009 Oct 19;4(10):e7505. doi: 10.1371/journal.pone.0007505

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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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When outlier line H23 was omitted, the Spearman rank correlation coefficient rho = −0.74, P = 0.0135 by the Spearman rank test.