Wenz, J.
Schleede, S.
Khrennikov, K.
Bech, M. http://orcid.org/0000-0001-9109-7175
Thibault, P.
Heigoldt, M.
Pfeiffer, F.
Karsch, S.
Article History
Received: 16 December 2014
Accepted: 19 May 2015
First Online: 20 July 2015
Competing interests
: The authors declare no competing financial interests.