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Authors
Spalek, K
Coynel, D https://orcid.org/0000-0001-5028-5807
Freytag, V
Hartmann, F https://orcid.org/0000-0001-7511-3251
Heck, A
Milnik, A https://orcid.org/0000-0002-3933-3289
de Quervain, D
Papassotiropoulos, A
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Article History
Received: 20 July 2015
Revised: 4 January 2016
Accepted: 19 January 2016
First Online: 15 March 2016
Competing interests
: The authors declare no conflict of interest.
