Kato, Kikuya
Uchida, Junji
Kukita, Yoji
Kumagai, Toru
Nishino, Kazumi
Inoue, Takako
Kimura, Madoka
Oba, Shigeyuki
Imamura, Fumio
Article History
Received: 15 March 2016
Accepted: 14 June 2016
First Online: 6 July 2016
Competing interests
: The authors declare no competing financial interests.