Article History
Received: 7 January 2019
Accepted: 12 June 2019
First Online: 22 July 2019
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 approved use of their data. As the study utilized existing registry data, no written or verbal consent to participate was required.
: Not applicable.
: The authors declare that they have no competing interests.