Funding for this research was provided by:
Received: 8 October 2020
Accepted: 8 December 2020
First Online: 5 January 2021
Compliance with ethical guidelines
: T. Thormann and P. Wicker 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. Informed consent was obtained from all individual participants included in the study.