Received: 16 April 2020
Accepted: 16 July 2020
First Online: 22 July 2020
Ethics approval and consent to participate
: Data were pseudonymized with the removal of the CPR-number after linkage. According to Danish law, registry-based studies do not require informed consent of patients. The Danish Data Protection Agency (2008-58-0028) approved the database, the Danish Patient Safety Authority (3–3013-1675/1) approved transmission of the electronic data from the prehspital medical record.
: Not applicable.
: The authors declare that they have no competing interests.