Funding for this research was provided by:
National Natural Science Foundation of China (No. 81772421)
Article History
Received: 31 August 2020
Accepted: 22 March 2021
First Online: 6 April 2021
Declarations
:
: The study was approved by the Ethics Committee of Beijing Chaoyang Hospital (The third Affiliated Hospital of Capital Medical University). Informed consent was waived due to its retrospective nature.
: Not applicable.
: The authors declare that they have no competing interests.