Text and Data Mining valid from 2019-04-02
Accepted: 25 March 2019
First Online: 2 April 2019
Change Date: 15 May 2019
Change Type: Correction
Change Details: Co author name misspelt and should read as Masaaki Osaka.
Compliance with ethical standards
: There are no potential conflicts of interest, and this research did not involve human participants and/or animals.