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Authors
Fox, Henrik
Hemmann, Katrin
Lehmann, Ralf
- License Information
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Article History
Received: 19 January 2018
Revised: 2 September 2019
Accepted: 1 October 2019
First Online: 19 October 2019
Compliance with ethical standards
:
: Ralf Lehmann received honorees for proctoring from EDWARDS Lifesciences. Henrik Fox and Katrin Hemmann have no conflicts of interest.
: All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1964 and later revisions.
: Due to the retrospective character of the study, written informed consent could not be obtained.
