Kawagoe, Toshikazu http://orcid.org/0000-0002-9342-8983
Matsushita, Masateru
Hashimoto, Mamoru
Ikeda, Manabu
Sekiyama, Kaoru
Article History
Received: 29 March 2017
Accepted: 13 October 2017
First Online: 30 October 2017
Competing Interests
: The authors declare that they have no competing interests.