Kumazawa, Takuya
Nishimura, Kazuho
Katagiri, Naohiro
Hashimoto, Sayaka
Hayashi, Yuki
Kimura, Keiji
Article History
Received: 28 October 2014
Accepted: 5 May 2015
First Online: 5 June 2015
Competing interests
: The authors declare no competing financial interests.