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Authors
Zirk, Matthias https://orcid.org/0000-0001-8776-0042
Zalesski, Artjom
Peters, Franziska
Kreppel, Matthias
Zinser, Max
Zöller, Joachim E.
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Article History
Received: 10 June 2018
Accepted: 15 September 2019
First Online: 23 October 2019
Compliance with Ethical Standards:
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: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.Local ethnics board exempts this study from a specific ethic vote due to its pure retrospective nature.
: For this type of study (retrospective study), formal consent is not required.
