Hu, Menglong
Guo, Jiubiao
Cheng, Qipeng
Yang, Zhiqiang
Chan, Edward Wai Chi
Chen, Sheng
Hao, Quan
Article History
Received: 7 September 2016
Accepted: 11 November 2016
First Online: 13 December 2016
Competing interests
: The authors declare no competing financial interests.