Received: 20 October 2021
Accepted: 15 March 2022
First Online: 10 April 2022
: In accordance with the institutional guidelines of the University of Oldenburg, an ethics consultation was conducted by the Medical Ethics Committee. As this is a study on anonymized data, no ethics vote was required and the conduct of the study was approved in its present form.
: According to institutional guidelines, no consent by subjects was needed.
: No competing interests.