Text and Data Mining valid from 2020-04-06
Received: 14 February 2020
Accepted: 23 March 2020
First Online: 6 April 2020
Ethics approval and consent to participate
: The study protocol was approved by the ethics committee, and guardians of all the patients provided informed consent for their inclusion at the Affiliated Cancer Hospital of Zhengzhou University.
: The participants’ legal guardians provided informed consent for the publication of the study.
: The authors declare that they have no competing interests.