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  21 Dec 2010
  23:03 GMT
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  Publisher's Note: Missing sentence in Results Posted by PLOS_ONE_Group on 21 Dec 2010 at 23:03 GMT
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  21 Dec 2010
  23:02 GMT
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  Publisher's Note: Error in Figure 2 Posted by PLOS_ONE_Group on 21 Dec 2010 at 23:02 GMT