Funding for this research was provided by:
Beijing Natural Science Foundation of China (7192035)
Article History
Received: 24 August 2019
Accepted: 10 January 2020
First Online: 17 January 2020
Ethics approval and consent to participate
: This study was approved by the Clinical Research Ethics Committee of the Peking University Cancer Hospital and was performed in compliance with the Helsinki Declaration. Written informed consent was obtained from all patients.
: Not Applicable.
: The authors declare that they have no competing interests.