Wang, Ligong http://orcid.org/0000-0003-2342-4343
Article History
Received: 2 July 2019
Accepted: 28 November 2019
First Online: 27 December 2019
Change Date: 30 January 2020
Change Type: Correction
Change Details: Following publication of the original article [1], the authors flagged that the article had published with an error in one of the equations (Eq. 46), in addition to a few minor formatting errors (concerning spacing and parentheses).
Competing interests
: The author declares that he has no competing interests.