Takenaka, Hideki http://orcid.org/0000-0001-5661-478X
Carrasco-Casado, Alberto http://orcid.org/0000-0002-3412-7945
Fujiwara, Mikio
Kitamura, Mitsuo http://orcid.org/0000-0001-8540-7210
Sasaki, Masahide
Toyoshima, Morio
Article History
Received: 27 March 2017
Accepted: 6 June 2017
First Online: 10 July 2017
Competing interests
: The authors declare no competing financial interests.