Kamei, Jun http://orcid.org/0000-0002-0069-7392
Ito, Hiroki http://orcid.org/0000-0002-4433-370X
Aizawa, Naoki http://orcid.org/0000-0002-4645-9293
Hotta, Harumi
Kojima, Toshio
Fujita, Yasunori
Ito, Masafumi
Homma, Yukio
Igawa, Yasuhiko
Article History
Received: 20 November 2017
Accepted: 17 January 2018
First Online: 1 February 2018
Competing Interests
: The authors declare that they have no competing interests.