Li, Changqing
Jia, Weihua
Li, Jian
Li, Fangfei
Ma, Jing
Zhou, Lichun
Article History
Received: 20 December 2020
Accepted: 22 February 2021
First Online: 9 March 2021
Declarations
:
: The Medical Ethics Committee of Beijing Chaoyang Hospital and Shijingshan Hospital approved this study, which was consistent with the Declaration of Helsinki, and the requirement for written informed consent was waived due to the retrospective design. Patient data have been de-identified upon data collection.
: Not applicable.
: The authors declare that they have no competing interests.