Funding for this research was provided by:
Forskningsrådet för Arbetsliv och Socialvetenskap (2007)
Received: 5 February 2020
Accepted: 24 November 2020
First Online: 12 January 2021
Ethics approval and consent to participate
: The study was approved by the Regional Ethics Board in Uppsala, Sweden (2008/157). All the study participants consented to participate.
: All listed authors have approved of the submission of the manuscript to the journal.
: The authors declare that they have no conflict of interest.