Received: 15 July 2019
Accepted: 11 November 2020
First Online: 25 November 2020
Ethics approval and consent to participate
: The Regional Committee for Medical and Health Research Ethics granted approval for the research project (REK 2014/1970), and all registry owners consented to their data being utilized. As the study utilised existing registry data, no written or verbal consent to participate was required.
: Not applicable.
: The authors declare that they have no competing interests.