Ruan, Kun
Yamamoto, Takaharu G.
Asakawa, Haruhiko
Chikashige, Yuji
Kimura, Hiroshi
Masukata, Hisao
Haraguchi, Tokuko
Hiraoka, Yasushi
Article History
Received: 16 April 2015
Accepted: 6 July 2015
First Online: 30 July 2015
Competing interests
: The authors declare no competing financial interests.