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Publisher's Note: Missing Corresponding Author Symbol

Posted by PLOS_ONE_Group on 30 Jun 2014 at 17:28 GMT

Yundai Chen and Changyong Wang are both corresponding authors on this article. Both of their emails are correctly listed in the PDF and XML, but the corresponding author symbol is missing next to Yundai Chen's name. The journal apologizes for this error that occurred during the typesetting process.

No competing interests declared.