Wang, Hua-Ling
Yang, Jiao
Boykin, Laura M.
Zhao, Qiong-Yi
Wang, Yu-Jun
Liu, Shu-Sheng
Wang, Xiao-Wei
Article History
Received: 20 February 2014
Accepted: 22 August 2014
First Online: 15 September 2014
Competing interests
: The authors declare no competing financial interests.