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Authors
Müther, Michael https://orcid.org/0000-0001-9427-5555
Stummer, Walter
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Article History
Received: 1 September 2019
Accepted: 7 November 2019
First Online: 21 November 2019
Compliance with ethical standards
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: Walter Stummer reports consultant and lecture activities activity for medac (Wedel, Germany), Carl Zeiss Meditech (Oberkochen, Germany), and NxDc (Lexington, KY, USA). Michael Müther reports no conflicts of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committee (Ethics Committee University of Münster) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. For this type of study, formal consent is not required.
