Hirata, Akihiko
Kohara, Shinji
Asada, Toshihiro
Arao, Masazumi
Yogi, Chihiro
Imai, Hideto
Tan, Yongwen
Fujita, Takeshi http://orcid.org/0000-0002-2318-0433
Chen, Mingwei
Article History
Received: 14 December 2015
Accepted: 12 April 2016
First Online: 13 May 2016
Competing interests
: The authors declare no competing financial interests.