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Scientific Reports 6: Article number: 31703; 10.1038/srep31703 published online: August 17 2016; updated: November 08 2016.
The original version of this Article contained a typographical error in the spelling of the author Xiaochun Wan, which was incorrectly given as Xiachun Wan. This has now been corrected in the PDF and HTML versions of the Article.
