Takano, Kenichi
Ogasawara, Noriko
Matsunaga, Tatsuo
Mutai, Hideki
Sakurai, Akihiro
Ishikawa, Aki
Himi, Tetsuo
Article History
Received: 11 April 2016
Revised: 23 May 2016
Accepted: 27 June 2016
First Online: 4 August 2016
Competing interests
: The authors declare no conflict of interest.