Katsura, Hiroaki
Fukuyama, Satoshi
Watanabe, Shinji
Ozawa, Makoto
Neumann, Gabriele
Kawaoka, Yoshihiro
Article History
Received: 21 September 2015
Accepted: 21 December 2015
First Online: 5 February 2016
Competing interests
: The authors declare no competing financial interests.