Funding for this research was provided by:
National Major Science and Technology Projects of China (2017ZX10103007-001, 2017ZX10103007-005)
Received: 19 August 2019
Accepted: 4 May 2020
First Online: 14 May 2020
Ethics approval and consent to participate
: The Liaoning Provincial Center for Disease Control Medical Ethics Review Committee approved this research. All participants Informed consent by written.
: Not applicable.
: The authors declare that there is no conflict of interest regarding the publication of this article.