Funding for this research was provided by:
National Natural Science Foundation of China (81501469)
Beijing Municipal Science & Technology Commission (Z181100001718099)
Received: 23 April 2020
Accepted: 1 January 2021
First Online: 25 January 2021
Ethics approval and consent to participate
: This study was approved by the institutional ethics committee of China-Japan Friendship Hospital, and the requirement for informed consent was waived due to the retrospective nature of the analysis.
: Not applicable.
: The authors declare that they have no competing interests.