Song, Qiaofeng
Liu, Xiaoxue
Zhou, Wenhua
Wu, Shouling
Wang, Xizhu
Article History
Received: 20 February 2020
Accepted: 10 August 2020
First Online: 15 August 2020
Ethics approval and consent to participate
: The study was approved by the Ethics Committee of Kailuan General Hospital in compliance with the Declaration of Helsinki, and all participants provided written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.