Funding for this research was provided by:
Open Access Publishing Fund of the University of Tübingen
Received: 6 February 2021
Accepted: 24 March 2021
First Online: 8 April 2021
: 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 returned the patient-reported outcome measures gave their informed consent. For patients who were lost to follow-up, consent was waived, since in these patients only a retrospective, pseudonymised data evaluation was performed.
: Not applicable.
: The authors declare that they have no competing interests.