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Authors
Mirifar, Arash https://orcid.org/0000-0001-8214-5155
Keil, Andreas
Beckmann, Jürgen
Ehrlenspiel, Felix
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Article History
Received: 22 June 2018
Accepted: 3 September 2018
First Online: 18 September 2018
Compliance with Ethical Standards
: Participants provided informed consent before taking part, and the study was approved by the ethics committee of Technical University of Munich.
: The authors declare that they have no competing interests.
