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Authors
Windfuhr, J. P.
Chen, Y.-S.
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Article History
First Online: 22 January 2020
Compliance with ethical guidelines
:
: J. P. Windfuhr and Y.-S. Chen declare that they have no competing interests.
: The study was exempt from ethic approval according § 15 of the Professional Code of Conduct of the regional Medical Association (North Rhine).
: The supplement containing this article is not sponsored by industry.
