Xiang, Libing
Jiang, Wei
Li, Jiajia
Shen, Xuxia
Yang, Wentao
Yang, Gong
Wu, Xiaohua
Yang, Huijuan
Article History
Received: 27 March 2015
Accepted: 11 August 2015
First Online: 11 September 2015
Change Date: 5 October 2015
Change Type: Update
Change Details: The version of this Article previously published incorrectly indicated that Gong Yang, Xiaohua Wu and Huijuan Yang contributed equally to the work, rather than Libing Xiang and Wei Jiang. These errors have now been corrected in both the PDF and HTML version of the paper. In addition, Gong Yang, Xiaohua Wu and Huijuan Yang were not listed as corresponding authors in the HTML version of this paper. Correspondence and request for materials should be addressed to yanggong@fudan.edu.cn, docwuxh@hotmail.com and huijuanyang@hotmail.com. This has now been corrected in the HTML.
Competing interests
: The authors declare no competing financial interests.