Xu, Jiajia http://orcid.org/0000-0002-6084-2029
Wang, Yiyun
Li, Jing
Zhang, Xudong
Geng, Yiyun
Huang, Yan
Dai, Kerong
Zhang, Xiaoling
Article History
Received: 15 March 2016
Revised: 28 April 2016
Accepted: 31 May 2016
First Online: 29 July 2016
Competing interests
: The authors declare no conflict of interest.