Funding for this research was provided by:
National Natural Science Foundation of China (No.81372180, No.81902745)
Natural Science Foundation of Hainan Province (2018JJ3716)
the Hunan Provincial Science and Technology Association program (2017TJ-Q19)
the Hunan Provincial Science and Technology Association key-point program (2017DK2013)
the Hunan Provincial financial department program (No.95)
Received: 10 July 2019
Accepted: 9 November 2019
First Online: 25 November 2019
Ethics approval and consent to participate
: The OS sample collection from patients was approved by the Ethics Review Committee of the Second Xiangya Hospital of Central South University. The written informed consent was obtained from all enrolled patients.
: Not applicable.
: The authors declare that they have no competing interests.