Wang, Xudong
Hong, Yongjun
Cai, Peihong
Tang, Ning
Chen, Ying
Yan, Tizhen
Liu, Yinghua
Huang, Qiuying
Li, Qingge
Article History
Received: 21 September 2016
Accepted: 16 January 2017
First Online: 22 February 2017
Competing interests
: The authors declare no competing financial interests.