Funding for this research was provided by:
Grant from the Ministry of Science and Technology of the People’s Republic of China (2017YFC1601400)
Grant from the Scientific and Technology Department of Henan Province (182102110332)
Text and Data Mining valid from 2019-06-28
Received: 14 March 2019
Accepted: 7 June 2019
First Online: 28 June 2019
Compliance with Ethical Standards
: We declare that the ethical background of this study was approved by the National Ethical Committee.
: The authors declare that they have no conflicts of interest.