Article History
Received: 28 December 2018
Accepted: 28 January 2019
First Online: 27 February 2019
Compliance with ethical standards
:
: Akira Naito declares that he has no conflict of interest. Yoshiteru Makino declares that he has no conflict of interest. Arisu Shigeta declares that she has no conflict of interest. Izuru Kawamura declares that he has no conflict of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors.