Received: 29 May 2021
Accepted: 31 August 2021
First Online: 15 September 2021
: According to Danish law, retrospective studies do not need approval by a Committee on Health Research Ethics. Informed consent was waived given the retrospective nature of the study. The Danish Patient Safety Authority approved the study (ID-number: 31-1522-71).
: Not applicable.
: The authors declare no conflict of interest.