Sun, Ya-Ping
Wang, Ping
Lu, Zhuomin
Yang, Fan
Meziani, Mohammed J.
LeCroy, Gregory E.
Liu, Yun
Qian, Haijun
Article History
Received: 10 March 2015
Accepted: 26 June 2015
First Online: 21 July 2015
Competing interests
: The authors declare no competing financial interests.