Otsubo, Makoto http://orcid.org/0000-0003-1222-2578
Katayama, Ikuo http://orcid.org/0000-0002-8664-0409
Miyakawa, Ayumu http://orcid.org/0000-0001-8089-6406
Sagiya, Takeshi http://orcid.org/0000-0001-7949-8048
Article History
Received: 27 September 2019
Accepted: 22 February 2020
First Online: 4 March 2020
Competing interests
: The authors declare that they have no competing interests.