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Article History

Received: 13 December 2020

Accepted: 19 March 2021

First Online: 31 May 2021

Declarations

:

: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. The Ethics Committee of the Baden-Württemberg Medical Council reviewed the study and approved it (Ref. Ident. No. F-2020-056-z; date of decision 30/06/2020). For this type of study, formal consent was not required.

: The authors affirm that human research participants provided informed consent for the publication of the images in Figs. InternalRef removed, InternalRef removed, InternalRef removed, and InternalRef removed.The authors are responsible for the correctness of the statements provided in the manuscript. See also Authorship Principles. The Editor-in-Chief reserves the right to reject submissions that do not meet the guidelines described in this section.

: Michael Korsch, Winfried Walther, Matthias Hannig, and Andreas Bartols declare that they have no competing interests.