Lei, Jun H.
Liu, Liang R.
Wei, Qiang
Song, Tu R.
Yang, Lu
Yuan, Hai C.
Jiang, Yong
Xu, Huan
Xiong, Sheng H.
Han, Ping
Article History
Received: 2 July 2014
Accepted: 26 March 2015
First Online: 5 May 2015
Competing interests
: The authors declare no competing financial interests.