Watanabe, Noriaki http://orcid.org/0000-0002-3876-2794
Numakura, Tatsuya
Sakaguchi, Kiyotoshi
Saishu, Hanae
Okamoto, Atsushi
Ingebritsen, Steven E.
Tsuchiya, Noriyoshi
Article History
Received: 27 September 2016
Accepted: 13 December 2016
First Online: 23 January 2017
Competing interests
: The authors declare no competing financial interests.