Ji, Yuanchao
Wang, Dong
Wang, Yu
Zhou, Yumei
Xue, Dezhen
Otsuka, Kazuhiro
Wang, Yunzhi
Ren, Xiaobing
Article History
Received: 18 November 2015
Revised: 8 May 2017
Accepted: 8 August 2017
First Online: 12 October 2017
Competing interests
: The authors declare that they have no competing financial interests.