Wang, Shaoheng
Liu, Pengfei
Gao, Teng
Guan, Lei
Li, Tianzuo
Article History
Received: 6 January 2020
Accepted: 15 July 2020
First Online: 11 August 2020
Ethics approval and consent to participate
: This study was approved by the ethics committee of Beijing shijitan hospital affiliated to capital medical university. Approval code: 2019 Research ethics No.69. This study is retrospective, only anonymous data sources were used, and informed consent was not required.
: Not Applicable.
: The authors declare that they have no competing interests.