Kato, Kumiko
Takashima, Yuko
Matsunaga, Koichi
Sugimoto, Masahiko
Matsubara, Hisashi
Hirano, Koji
Kondo, Mineo
Article History
Received: 28 August 2015
Accepted: 15 December 2015
First Online: 14 January 2016
Competing interests
: The authors declare no competing financial interests.