Yamamoto, Kosuke
Shimizu, Takashi
Igawa, Kazunobu
Tomooka, Katsuhiko
Hirai, Go
Suemune, Hiroshi
Usui, Kazuteru
Article History
Received: 10 June 2016
Accepted: 12 October 2016
First Online: 8 November 2016
Competing interests
: The authors declare no competing financial interests.