Funding for this research was provided by:
National Natural Science Foundation of China (81472714)
Received: 17 August 2020
Accepted: 12 February 2021
First Online: 23 February 2021
Ethics approval and consent to participate
: This study was carried out in accordance with the ethical guidelines of the 1975 Declaration of Helsinki and was approved by the ethics committee of the Affiliated Cancer Hospital of Zhengzhou University (IRB No.2019041). Written informed consent was obtained from every patient for the use of the medical records for research purposes.
: Not applicable.
: The authors have declared that no competing interests exist.