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Authors
Klimek, Ludger
Aderhold, Christoph
Sperl, Annette
Trautmann, Axel
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Article History
Received: 7 December 2016
Accepted: 6 February 2017
First Online: 22 May 2017
Conflict of interest
: L. Klimek, C. Aderhold, A. Sperl and A. Trautmann declare that they have no competing interests.
Free to read: This content has been made available to all.
