Funding for this research was provided by:
Received: 11 June 2021
Accepted: 11 October 2021
First Online: 24 October 2021
: This study was approved by the Ethics Committee of Friedrich-Alexander-University Erlangen-Nuremberg (Petition No. 450_20Bc). Informed consents were waived due to its retrospective observational nature.
: Consent to the publication of the image material is given.
: The authors declare that they have no competing interests.