Funding for this research was provided by:
the Chinese Medical Association Clinical Medical Research Special Fund Project (FDN-17020190688)
the Medical Science and Technology Research Project Joint Co-construction Project of Henan Province (FDN-2018020116)
the Henan Provincial Higher Education Key Research Project Plan (FDN-19A320056)
Text and Data Mining valid from 2019-11-29
Received: 10 July 2019
Revised: 19 September 2019
Accepted: 2 October 2019
First Online: 29 November 2019
Ethics approval and consent to participate
: Our research was approved by the Medical Ethics Committee of the First Affiliated Hospital of Zhengzhou University.
: The study was undertaken with the hospital’s consent.
: The authors declare that they have no competing interests.