Shi, Boqun
Liu, Demin
Wang, Qian
Geng, Xue
Hou, Qian
Gu, Guoqiang
Xie, Ruiqin
Cui, Wei http://orcid.org/0000-0002-2594-576X
Article History
Received: 6 September 2020
Accepted: 22 September 2021
First Online: 2 October 2021
Declarations
:
: The study was conducted in line with the principles of the Helsinki Declaration. Ethical approval (No: 2019-P060) was granted by the Research Ethics Committee of the Second Hospital of Hebei University in 2019. The present study retrospectively analysed anonymized data; thus, no informed consent was required.
: Not applicable.
: The authors declare that they have no competing interests.