Funding for this research was provided by:
National Key R&D Program of China (2018YFC0114501)
2021 Postgraduate Education Reform and Quality Improvement Project of Henan Province (YJS2021KC07)
Zhengzhou University 2020 Key Project of Discipline Construction (XKZDQY202007)
Received: 23 October 2020
Accepted: 12 May 2021
First Online: 25 May 2021
: After reviewed by the Bioethics Committee of Zhengzhou University, the research content and process of the project complied with the international and national ethical requirements for biomedical research and the study was approved and obtained exemption from other review process. The data described in this study has been approved for analysis and publish by Health Commission of Henan Province.
: Not applicable.
: The authors declare that they have no competing interests.