Wang, Haifang
Fan, Zenghua
Zhao, Meng
Li, Juan
Lu, Minghua
Liu, Wei
Ying, Hao
Liu, Mofang
Yan, Jun
Article History
Received: 14 October 2015
Accepted: 27 January 2016
First Online: 22 February 2016
Competing interests
: The authors declare no competing financial interests.