Shan, Yufeng
Zheng, Zhihui
Liu, Jianjun
Yang, Yong
Li, Zhiyuan
Huang, Zhengren
Jiang, Dongliang
Article History
Received: 22 June 2016
Revised: 29 December 2016
Accepted: 11 January 2017
First Online: 15 March 2017
Competing interests
: The authors declare no competing interests.