Zheng, Lei
Xu, Hongmei
Di, Ya
Chen, Lanlan
Liu, Jiao
Kang, Liying
Gao, Liming
Article History
Received: 2 January 2021
Accepted: 27 May 2021
First Online: 9 August 2021
Declarations
:
: The study was approved by the ethics committee of the First Hospital of Qinhuangdao. This study was in line with the <i>Declaration of Helsinki</i>, and all patients signed informed consent.
: Not applicable.
: The authors declare that they have no competing interests.