Document is current
Any future updates will be listed below
-
Authors
-
Funding
Funding for this research was provided by:
Major Research Plan (71433005)
- License Information
-
More Information
Article History
Received: 14 August 2019
Accepted: 4 February 2020
First Online: 6 February 2020
Ethics approval and consent to participate
: This study used secondary data collected from open source available to every researcher. Data are freely downloadable at the official website ( ). Therefore, we believe that ethical approval and consent to participate are not applicable.
: Not applicable.
: The authors have no competing interests to declare.
