Received: 17 November 2020
Accepted: 7 April 2021
First Online: 20 April 2021
: Register-based studies do not need approval by Ethical Committee according to Danish law. The study was registered at the North Denmark Region (project ID number 2019–112) and approved by The Danish Patient Safety Authority (3–3013-1675/3).
: Not applicable.
: The authors declare that they have no competing interests.