Wang, Peng-Fei
Sun, Zhuo-Ran
Yu, Jin-Chao
Geng, Na
Liu, Ling-Yun
Zhu, Li-Na
Li, Jing
Yuan, Hai-Cheng
Zhao, Guo-chen
Li, Zhen-Guang
Article History
Received: 14 June 2021
Accepted: 30 September 2021
First Online: 10 November 2021
Declarations
:
: The study protocol was separately approved by Weihai Municipal Hospital, Shandong University ethics committee and Qingdao Central Hospital ethics committee. Because this was a retrospective observational cohort study, the data were anonymous; consequently, the ethics committee waived the requirement for informed consent. All methods were performed in accordance with the relevant guidelines and regulations.
: The manuscript has been approved by all authors for publication.
: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.