Funding for this research was provided by:
Deutsche Forschungsgemeinschaft (BU 1141/13-1)
Received: 8 September 2020
Accepted: 7 January 2021
First Online: 18 January 2021
Ethics approval and consent to participate
: The manuscript or parts of it were not published or submitted elsewhere. The study was performed according to the updated guidelines of good clinical practice and Declaration of Helsinki. Informed consent was obtained from all patients.
: Not applicable.
: The authors have no competing interests.