Shi, Chunmei
Zhang, Min
Tong, Meiling
Yang, Lei
Pang, Lingxia
Chen, Ling
Xu, Guangfeng
Chi, Xia
Hong, Qin
Ni, Yuhui
Ji, Chenbo
Guo, Xirong
Article History
Received: 2 November 2014
Accepted: 25 February 2015
First Online: 22 May 2015
Change Date: 24 July 2015
Change Type: Update
Change Details: The version of this Article previously published omitted Chunmei Shi and Min Zhang as equally contributing authors. This has now been corrected in both the PDF and HTML version of the paper.
Competing interests
: The authors declare no competing financial interests.