Maruyama, Hitoshi
Shiina, Shuichiro
Article History
Received: 23 February 2020
Accepted: 7 April 2020
First Online: 29 April 2020
Compliance with ethical standards
:
: Hitoshi Maruyama and Shuichiro Shiina have declared that there is no conflict of interest.
: This article does not contain any studies with human participants or animals performed by any of authors.
: Not necessary, see above.
Free to read: This content has been made available to all.