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Authors
Schlitzer, J.
Heppner, H. J.
Frohnhofen, H.
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Article History
Received: 18 November 2020
Accepted: 12 January 2021
First Online: 3 February 2021
Compliance with ethical guidelines
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: J. Schlitzer, H. J. Heppner and H. Frohnhofen declare that they have no competing interests.
: All procedures performed in studies involving human participants or on human tissue were in accordance with the ethical standards of the institutional and/or national research committee and with the 1975 Helsinki declaration and its later amendments or comparable ethical standards. The protocol documents were approved by the chamber of physicians (North Rhine, Germany) and the trial was registered in the German Clinical Trials Register (DRKS-ID: DRKS00004898). Informed consent was obtained from all individual participants included in the study.
