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Article History

Received: 18 January 2021

Accepted: 5 March 2021

First Online: 22 March 2021

Declarations

:

: Patients who were alive at six months after hospitalisation, and able to receive and understand information about the study, signed a written informed consent to participate. If the patient was not able to consent, a passive consent to participate was assumed. The patient’s proxy was then informed about the study and could withdraw participation on behalf of the patient. The need for written informed consent from the proxy of patients who were unable to consent was waived by the Norwegian Regional Committees for Medical and Health Research Ethics (REC Central, reference number 155425), due to the retrospective nature of the study, and that participation would imply minimal risk or disadvantage for the participants. Patients who died were included with patient administrative data only, and the need for informed consent was waived by the REC Central (reference number 155425) due to the retrospective nature of the study. Participants or next-of-kin were at any time able to withdraw from the study.The study was approved by the Norwegian Regional Committees for Medical and Health Research Ethics (REC Central, reference number 155425) and the officers of data protection at all the participating centres, and complies with the Declaration of Helsinki.

: Not applicable.

: The authors declare that they have no competing interests.