Wang, Xianfen
Kajiyama, Satoshi
Iinuma, Hiroki
Hosono, Eiji
Oro, Shinji
Moriguchi, Isamu
Okubo, Masashi
Yamada, Atsuo
Article History
Received: 8 November 2014
Accepted: 7 February 2015
First Online: 2 April 2015
Competing interests
: The authors declare no competing financial interests.