Kawada, Tomoyuki http://orcid.org/0000-0002-4426-4644
Article History
Received: 26 February 2019
Accepted: 5 March 2019
First Online: 9 March 2019
Compliance with ethical standards
:
: The author declares that there are no conflicts of interest.
: This article contains no studies with human participants or animals performed by the author.
: For this type of study, formal consent is not required.