Funding for this research was provided by:
National Natural Science Foundation of China (No.81972802)
the Henan Health Science and Technology Innovation Talent Project (201004057)
the Project of Henan Health of China (201203149)
Received: 24 June 2019
Accepted: 3 October 2019
First Online: 24 October 2019
Ethics approval and consent to participate
: The study protocol was approved by institutional review board of Henan Cancer Hospital, and written informed consent was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.