Hattori, T
Hayakawa, M http://orcid.org/0000-0001-5217-3219
Ito, M
Sato, Y
Tamakoshi, K
Kanamori, Y
Okuyama, H
Inamura, N
Takahashi, S
Fujino, Y
Taguchi, T
Usui, N
Article History
Received: 22 June 2016
Revised: 6 October 2016
Accepted: 10 October 2016
First Online: 15 December 2016
Competing interests
: Tetsuo Hattori wrote the first draft of the manuscript. The remaining authors declare no conflict of interest.