Funding for this research was provided by:
the Science and Technology Program of Henan Province (No. 182102310370, 192102310389)
Text and Data Mining valid from 2020-02-13
Received: 7 October 2019
Accepted: 30 January 2020
First Online: 13 February 2020
Ethics approval and consent to participate
: All analyses were based on previous published studies; thus, no ethical approval and patient consent are required.
: Not applicable
: The authors declare that they have no competing interests.