Xue, Yuanchao
Qian, Hao
Hu, Jing
Zhou, Bing
Zhou, Yu
Hu, Xihao
Karakhanyan, Aziz
Pang, Zhiping http://orcid.org/0000-0002-6183-1233
Fu, Xiang-Dong
Article History
Received: 2 December 2015
Accepted: 31 March 2016
First Online: 25 April 2016
Competing interests
: The authors declare no competing financial interests.