Kawada, Tomoyuki https://orcid.org/0000-0002-4426-4644
Article History
Received: 10 July 2018
Accepted: 28 July 2018
First Online: 20 August 2018
Compliance with ethical standards
:
: The author declares that he has no competing interests.
: 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.