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Publisher's Note: Error in the text.

Posted by PLOS_ONE_Group on 27 Sep 2012 at 23:07 GMT

10.2%
http://plosone.org/article/info:doi/10.1371/journal.pone.0036174#article1.front1.article-meta1.abstract1.sec2.p1

In the abstract, "10.2% in Xuhui-Tianping" should be revised to "13.3% in Xuhui-Tianping". The error does not influence the final conclusion.

No competing interests declared.