Lu, Ruigang
Zhao, Wei
Yin, Li
Guo, Ruijun
Wei, Bojun
Jin, Mulan
Zhou, Xiang
Zhang, Chun
Lv, Xiuzhang
Article History
Received: 27 January 2021
Accepted: 10 May 2021
First Online: 21 May 2021
Declarations
:
: The study was approved by the Institutional Review Board and Ethics Committee of Beijing Chaoyang Hospital, Capital Medical University. According to the ethical committee policy, this is a completely anonymous, retrospective study and is exempt from informed consent from patients. We confirm that all methods were performed in accordance with the relevant guidelines and regulations.
: Not applicable.
: The authors declare that they have no competing interests.