Ma, Jie
Jiang, Peiqiang
Ji, Bai
Song, Yanqing
Liu, Yahui
Article History
Received: 13 January 2021
Accepted: 22 March 2021
First Online: 30 March 2021
Declarations
:
: The study protocol was approved and informed consent was waived due to the retrospective nature of this study by the Ethical Committee of the First Hospital of Jilin University (Ethics Approval Number: 2019-232). All procedures performed in studies involving human participants were in accordance with the ethics standards of the institutional and national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethics standards.
: Not applicable.
: The authors declare that they have no competing interests.