Zhang, Zhenxin
Murayama, Toru
Sadakane, Masahiro
Ariga, Hiroko
Yasuda, Nobuhiro
Sakaguchi, Norihito
Asakura, Kiyotaka
Ueda, Wataru
Article History
Received: 2 February 2015
Accepted: 4 June 2015
First Online: 3 July 2015
Competing interests
: The authors declare no competing financial interests.