Fukuda, Shinji
Nishida-Fukuda, Hisayo
Nanba, Daisuke
Nakashiro, Koh-ichi
Nakayama, Hironao
Kubota, Hiroyuki
Higashiyama, Shigeki
Article History
Received: 8 September 2015
Accepted: 23 December 2015
First Online: 2 February 2016
Competing interests
: The authors declare no competing financial interests.