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Publisher's Note: Correction to Figure 3

Posted by PLOS_ONE_Group on 24 Nov 2008 at 21:27 GMT

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http://plosone.org/article/info:doi/10.1371/journal.pone.0003654#pone-0003654-g003

Figure 3 is rotated incorrectly. Please view the figure in its correct orientation here: http://www.plosone.org/corrections/pone.0003654.g003.cn.tif