Article History
Received: 6 September 2018
Accepted: 25 July 2019
First Online: 31 July 2019
Ethics approval and consent to participate
: The institutional research committee of the Affiliated Cancer Hospital of Zhengzhou University approved our study (approval number: HNZZ20150079), and all participants provided written informed consent. The study was conducted in accordance with Helsinki Declaration.
: Not applicable.
: The authors declare that they have no competing interests.