Funding for this research was provided by:
Norges Forskningsråd (262700)
Received: 20 May 2020
Accepted: 7 October 2020
First Online: 19 October 2020
Change Date: 22 February 2021
Change Type: Correction
Change Details: A Correction to this paper has been published:
Change Details: https://doi.org/10.1186/S12879-021-05913-2
Ethics approval and consent to participate
: All data is collected from registries and are aggregated and anonymous, and ethical approval and consent to participate was not required for this study, as stated in §3–5 of the Norwegian Patient Registry law (ExternalRef removed). Numbers less than five are not published in this paper. Data from the NPR, including data used in this study, is delivered to researchers after a standard application and administrative process by NPR staff.
: Consent for publication was not required for this study, since the study does not contain any individual data.
: The authors declare that they have no competing interests.