Kawada, Tomoyuki http://orcid.org/0000-0002-4426-4644
Article History
Received: 30 July 2019
Accepted: 13 August 2019
First Online: 28 August 2019
Compliance with ethical standards
:
: The author declares that he has no competing interests.
: This article does not contain any studies with human or animal subjects performed by the any of the authors.
: For this type of study, formal consent is not required.