Funding for this research was provided by:
Tianjin Major Scientific and Technological Special Project for Major Disease Prevention and Control (19ZXDBSY00090)
Article History
Received: 18 August 2020
Accepted: 26 March 2021
First Online: 13 April 2021
Declarations
:
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the Institutional Research Committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. This study was approved by the Ethics Committee of Tianjin Medical University Cancer Institution and Hospital (Approval No. bc2021001). The need for informed patient consent was waived because of the retrospective nature of the study. As a retrospective study, a waiver of informed consent was approved by the Ethics Committee of Tianjin Medical University Cancer Institution and Hospital.
: Not applicable
: The authors declare that they have no competing interests.