Received: 9 December 2019
Accepted: 28 April 2020
First Online: 8 June 2020
Ethics approval and consent to participate
: Data for the present study were collected through a retrospective analysis of data from the NORIDES study. For this study, we obtained a separate approval from The Regional Committee for Medical and Health Research Ethics (approval number 2017/1254).
: Not applicable.
: The authors declare that they have no competing interests.