Xiong, Wei
Tang, Jiaoning
Zhu, Guangming
Han, Ningxu
Schlangen, Erik
Dong, Biqin
Wang, Xianfeng
Xing, Feng
Article History
Received: 4 February 2015
Accepted: 27 April 2015
First Online: 8 June 2015
Competing interests
: The authors declare no competing financial interests.