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Authors
Hartmann, Martin https://orcid.org/0000-0001-8069-5284
Frey, Beat
Mayer, Jochen
Mäder, Paul
Widmer, Franco https://orcid.org/0000-0002-1735-8397
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Article History
Received: 11 April 2014
Revised: 5 September 2014
Accepted: 23 September 2014
First Online: 31 October 2014
Competing interests
: The authors declare no conflict of interest.
