Zeng, Piaoe
Zhang, Annan
Song, Le
Liu, Jianfang
Yuan, Huishu
Zhang, Weifang
Funding for this research was provided by:
National Natural Science Foundation of China (81871326, 81471634)
Natural Science Foundation of Beijing Municipality (L182054)
Article History
Received: 6 January 2021
Accepted: 1 June 2021
First Online: 13 July 2021
Declarations
:
: This study was conducted as per the Declaration of Helsinki. The approval to the protocol was done by our institutional Research Ethics Committee and each regulation was followed. The requirement for consent was waived by the board due to the retrospective nature of the study.
: All the authors gave a signed consent to publish.
: The authors declare that they have no competing interests.