Liang, Shiheng
Geng, Rugang
Yang, Baishun
Zhao, Wenbo
Chandra Subedi, Ram
Li, Xiaoguang
Han, Xiufeng
Nguyen, Tho Duc
Article History
Received: 26 June 2015
Accepted: 9 December 2015
First Online: 20 January 2016
Competing interests
: The authors declare no competing financial interests.