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Authors
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Gäßler, Michael
Ruppert, Matthias
Lefering, Rolf
Bouillon, Bertil
Wafaisade, Arasch http://orcid.org/0000-0001-6265-9802
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Article History
Received: 18 March 2019
Accepted: 27 May 2019
First Online: 7 June 2019
Ethics approval and consent to participate
: Scientific evaluation of this research database received a positive assessment by the Central Ethics Commission of the University of Witten/Herdecke (no. 201/2015). As data were anonymised informed consent was not obtainable and thus waived by the ethics committee.
: Not applicable.
: The authors declare that they have no competing interests.
