Yang, Chen
Zhao, Xinhao
Sun, Dakang
Yang, Leilei
Chong, Chang
Pan, Yu
Chi, Xiumei
Gao, Yanhang
Wang, Moli
Shi, Xiaodong
Sun, Haibo
Lv, Juan
Gao, Yuanda
Zhong, Jin
Niu, Junqi
Sun, Bing
Article History
Received: 21 July 2014
Revised: 5 December 2014
Accepted: 5 December 2014
First Online: 16 February 2015
Competing interests
: The authors of this study have no conflicts to disclose.