Kawada, Tomoyuki http://orcid.org/0000-0002-4426-4644
Article History
Received: 3 September 2018
Accepted: 26 September 2018
First Online: 4 October 2018
Compliance with ethical standards
:
: Author declares that there is no conflict of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors.
: For this type of study, formal consent is not required.