Funding for this research was provided by:
Key Technologies Research and Development Program (2018YFC1313201)
Received: 11 September 2019
Accepted: 27 November 2019
First Online: 3 December 2019
Ethics approval and consent to participate
: The study was approved by Ethics Committee of Shandong Cancer Hospital. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the Helsinki declaration.
: Not applicable.
: The authors declare that they have no competing interests.