Funding for this research was provided by:
NWO-VIDI (452-14-006)
Uni Research Health, Norway (support)
Article History
Received: 5 March 2020
Accepted: 12 November 2020
First Online: 19 November 2020
Ethical approval and consent to participate
: The retrospective data from the medical registries were treated according to the guidelines set by the Norwegian data-protection official for handling of confidential and sensitive information (cf. The Norwegian Health Personnel Act 26). The data collection was approved by the Norwegian Centre for Research Data as a quality-assurance project, and it was not deemed obligatory to notify the regional committee for medical and health research ethics.
: Not applicable.
: None of the authors has any conflicts of interest, specific financial interests, relationships, or affiliations relevant to the subject matter or materials discussed in the manuscript.