Funding for this research was provided by:
Universitätsklinikum Schleswig-Holstein - Campus Kiel
Received: 15 October 2020
Accepted: 29 March 2021
First Online: 13 April 2021
: This study was approved by the responsible ethics committee of the Ruhr-University Bochum, Germany. All patients gave their verbal informed consent before examination. Written informed consent was waived because of the.retrospective nature of the study and the analysis of anonymous clinical data.The consent was noted in a general patient informed consent sheet for all patients before examination.
: Not applicable.
: The authors declare that they have no competing interests.