Takahashi, K. S.
Matsubara, Y.
Bahramy, M. S.
Ogawa, N.
Hashizume, D.
Tokura, Y.
Kawasaki, M.
Article History
Received: 16 December 2016
Accepted: 18 May 2017
First Online: 5 July 2017
Competing Interests
: The authors declare that they have no competing interests.