Funding for this research was provided by:
Received: 12 May 2020
Accepted: 5 January 2021
First Online: 14 January 2021
Ethics approval and consent to participate
: The need for approval was waived by the local ethics committee (Ärztekammer Hamburg) due to the retrospective study design.
: Consent for publication was obtained from all involved persons, whose images were used in the present manuscript.
: The datasets used and/or analyzed during the current study are available from the corresponding author (MA) on reasonable request.
: The authors declare that they have no competing interests.