Funding for this research was provided by:
National Natural Science Foundation of China (81472938, 91529304, 81473230, 81673468)
Received: 2 September 2019
Accepted: 16 January 2020
First Online: 23 January 2020
Ethics approval and consent to participate
: Study protocols were approved by the Ethics Committee of Jiangsu Tumor Hospital and the Affiliated Hospital of the Xuzhou Medical College. Informed consent was obtained from all patients included in this study.
: All authors agree with the content of the manuscript.
: The authors declare no competing interests.