Souma, S.
Chen, L.
OszwaĆdowski, R.
Sato, T.
Matsukura, F.
Dietl, T.
Ohno, H.
Takahashi, T.
Article History
Received: 29 March 2016
Accepted: 12 May 2016
First Online: 6 June 2016
Competing interests
: The authors declare no competing financial interests.