Wang, Yan
Yang, Lixia
Liu, Yaoping
Mei, Zengxia
Chen, Wei
Li, Junqiang
Liang, Huili
Kuznetsov, Andrej
Xiaolong, Du
Article History
Received: 18 February 2015
Accepted: 1 May 2015
First Online: 2 June 2015
Competing interests
: The authors declare no competing financial interests.