Funding for this research was provided by:
National Natural Science Foundation of China (81973154, 81502897)
Received: 6 July 2020
Accepted: 26 November 2020
First Online: 7 January 2021
Ethics approval and consent to participate
: We have got the ethics approval from the “Shan Xi tumor hospital ethics committee” and get the reference number of 201835. Because our research did not involve any participants’ identifiers such as name, address, only oral consent was obtained from each participant after they were informed about the study’s purpose and procedure and the confidentiality of data. This procedure was approved by the ethics committee.
: Not applicable.
: The authors declare that they have no competing interests.