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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. , , , and .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.