Arai, Hidenori http://orcid.org/0000-0001-6747-8680
Article History
Received: 21 September 2018
Accepted: 27 September 2018
First Online: 23 November 2018
Compliance with ethical standards
:
: The corresponding author states that there is no conflict of interest.
: This study does not contain any studies with human participants performed by the author.
: For this type of study no formal consent is required.