Watanabe, Kentaro http://orcid.org/0000-0002-9104-7458
Nagata, Takahiro
Oh, Seungjun
Wakayama, Yutaka
Sekiguchi, Takashi
Volk, János
Nakamura, Yoshiaki
Article History
Received: 25 July 2015
Accepted: 4 January 2016
First Online: 16 February 2016
Competing interests
: The authors declare no competing financial interests.