Received: 1 April 2021
Accepted: 8 June 2021
First Online: 16 June 2021
: The study was approved by the Swiss cantonal ethical review board (Kantonale Ethikkommission Bern), application BASEC-Nr. 2020-01559.Informed consent was not necessary for this retrospective study according to the Swiss human research act.
: Not applicable
: The authors declare that they have no competing interests