Received: 7 October 2021
Accepted: 22 March 2022
First Online: 15 April 2022
: The cantonal ethics committee of Zurich (BASEC-Nr. Req-2021-00882) granted an exemption from requiring ethics approval for this retrospective study, as it does not fall within the scope of the Human Research Act (HRA).
: Not applicable.
: The authors declare that they have no competing interests.