Funding for this research was provided by:
Received: 10 December 2020
Accepted: 17 March 2021
First Online: 29 March 2021
: The local ethics committee of Rhineland palatinate (no. 2020-15004) Mainz Germany approved the retrospective study, which was designed in accordance with the ethical standards laid down in the Declaration of Helsinki and its later amendments. Since the study protocol included only a retrospective, epidemiologic evaluation of anonymized and routine patient demographics, procedural and outcome specific parameters informed consent was waived by the local ethics commitee of Rhineland palatinate.
: Not applicable since no identifying pictures are included.
: Authors do not have any competing interest to declare.