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Authors
Pfeiffer, Friedrich https://orcid.org/0000-0001-5321-633X
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Article History
Received: 22 November 2018
Accepted: 29 July 2019
First Online: 14 August 2019
Compliance with ethical standards
:
: The author confirms that there are no potential conflict of interest.
: No research involving human beings or animals.
: The author consents to the ethical rules as given by the editors.
