Feng, Jinjin
Yan, Shaohua
Chen, Yan
Han, Liping
Wen, Lu
Guo, Xi
Wen, Yibo
Li, Yunlong
He, Xiangfei
Han, Zhongjiang
Ren, Chuanchuan
Jia, Zhiming
Guo, Zhan
Zhai, Rongqun
Wu, Junwei
Wen, Jianguo
Article History
Received: 13 August 2018
Revised: 6 June 2019
Accepted: 16 June 2019
First Online: 1 July 2019
Competing interests
: The authors declare no competing interests.
: All procedures in this study were performed in accordance with the ethical standards of the institutional research committee and in accordance with the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards.