Guo, Limin
Zhang, Yelong
Wang, Jiawei
Ma, Lipo
Ma, Shunchao
Zhang, Yantao
Wang, Erkang
Bi, Yujing
Wang, Deyu
McKee, William C.
Xu, Ye
Chen, Jitao
Zhang, Qinghua
Nan, Cewen
Gu, Lin
Bruce, Peter G.
Peng, Zhangquan
Article History
Received: 2 January 2015
Accepted: 24 June 2015
First Online: 3 August 2015
Competing interests
: The authors declare no competing financial interests.