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Authors
Bauer, Heiko
Alonso, Mercedes https://orcid.org/0000-0002-7076-2305
Färber, Christian
Elsen, Holger
Pahl, Jürgen
Causero, Andrea
Ballmann, Gerd
De Proft, Frank
Harder, Sjoerd https://orcid.org/0000-0002-3997-1440
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Article History
Received: 7 June 2017
Accepted: 27 October 2017
First Online: 8 January 2018
Competing interests
: The authors declare no competing financial interests.
