Funding for this research was provided by:
Open Access Publishing Fund of the University of Tübingen
Received: 19 December 2020
Accepted: 8 February 2021
First Online: 15 March 2021
Ethics approval and consent to participate
: The study was performed according to the ethical standards of the institutional and national research committee and with the 1964 Helsinki Declaration and its later amendments. The institutional review board approved this study (identification number: 180/2020BO1). Patients who could be contacted gave their informed consent. For patients who could not be contacted, consent was waived, as the study was only a retrospective, pseudonymised data evaluation.
: Not applicable.
: The authors declare that they have no competing interests.