Wang, Feijiu
Kozawa, Daichi
Miyauchi, Yuhei
Hiraoka, Kazushi
Mouri, Shinichiro
Ohno, Yutaka
Matsuda, Kazunari
Article History
Received: 6 June 2014
Accepted: 16 January 2015
First Online: 18 February 2015
Competing interests
: The authors declare no competing financial interests.