Song, He
Xiao, Xianhao
Liu, Gang
Zhou, Jianping
Article History
Received: 12 August 2021
Accepted: 10 January 2022
First Online: 17 February 2022
Declarations
:
: The study was approved by the ethics committee of the first hospital of China medical university. Patient consent was not required to review their medical records by the ethics committee of the first hospital of China medical university of its retrospective design, and exemption from informed consent did not adversely affect the health and rights of subjects. This study kept confidentiality of patient data and strictly complied with the Declaration of Helsinki and its later amendments or comparable ethical standards. Informed consent for this study had been waived by the ethic committee.
: Not applicable
: We declared no competing interests.