Kobayashi, A http://orcid.org/0000-0003-0648-6921
Yokoyama, Y http://orcid.org/0000-0001-5214-512X
Osawa, Y
Miura, R
Mizunuma, H
Article History
Received: 28 September 2015
Revised: 25 October 2015
Accepted: 29 October 2015
First Online: 20 November 2015
Competing interests
: The authors declare no conflict of interest.