Shima, Ryoichi
Li, Tian Cheng
Sendai, Yutaka
Kataoka, Chikako
Mori, Yoshio
Abe, Takayuki
Takeda, Naokazu
Okamoto, Toru
Matsuura, Yoshiharu
Article History
Received: 21 August 2015
Accepted: 28 January 2016
First Online: 24 February 2016
Competing interests
: The authors declare no competing financial interests.