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)
Text and Data Mining valid from 2019-10-24
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.