Funding for this research was provided by:
Norges Forskningsråd (255033)
Received: 6 September 2019
Accepted: 15 June 2020
First Online: 22 June 2020
Ethics approval and consent to participate
: The present study, together with study 1, was approved by Norwegian Centre for Research Data (NSD) and inclusion of data from Study 2 was approved by the Regional Committees for Medical and Health Research Ethics (REK). All participants gave informed, written consent.
: Not applicable.
: The authors declare that they have no competing interests.