Xing, R
Li, L
Chen, L
Gao, Z
Wang, H
Li, W
Cui, J
Tian, G
Liang, Q
Yu, J
Sung, J J
Luo, G
Gao, H
Xu, X
Yang, H
Wang, J
Zhang, X
Wang, J M
Huang, J
Yu, Y
Wang, J
Lu, Y
Article History
Received: 19 December 2014
Revised: 19 May 2015
Accepted: 24 July 2015
First Online: 14 September 2015
Competing interests
: The authors declare no conflict of interest.