Received: 12 March 2020
Accepted: 30 April 2020
First Online: 10 May 2020
Change Date: 17 August 2020
Change Type: Correction
Change Details: An amendment to this paper has been published and can be accessed via the original article.
Ethics approval and consent to participate
: Not applicable.
: This is an independent personal research project conducted at home at the author’s spare time, the author is willing to publish it to share with the international scientific communities and the policymakers.
: As mentioned above, it’s a personal independent research, no any external funding. Thus, there is no any conflicts with any body, any organizations or institutions.