Xiong, Xingjiang
Yang, Xiaochen
Duan, Lian
Liu, Wei
Zhang, Yun
Liu, Yongmei
Wang, Pengqian
Li, Shengjie
Li, Xiaoke
Article History
Received: 10 October 2016
Accepted: 17 January 2017
First Online: 22 February 2017
Competing interests
: The authors declare no competing financial interests.