Akai, Hiroyuki
Yasaka, Koichiro http://orcid.org/0000-0002-0324-6562
Kunimatsu, Akira http://orcid.org/0000-0002-7141-2585
Ohtomo, Kuni
Abe, Osamu
Kiryu, Shigeru http://orcid.org/0000-0003-1440-9483
Article History
Received: 26 February 2019
Accepted: 30 December 2019
First Online: 16 January 2020
Competing interests
: The authors declare no competing interests.