Liu, Liehua
Wang, Haoming
Wang, Jiangang
Wang, Qian
Cheng, Shiming
Li, Ying
Jin, Weidong
Wang, Zili
Zhou, Qiang
Article History
Received: 14 October 2018
Accepted: 16 July 2019
First Online: 17 August 2019
Ethics approval and consent to participate
: The present study was approved by the Ethics Committee of the General Hospital of Ningxia Medical University. Informed consent obtained from each participant was written.
: Not applicable.
: The authors declare that they have no competing interests.