Funding for this research was provided by:
Research Council of Norway (227039)
Received: 23 September 2019
Accepted: 5 March 2020
First Online: 30 March 2020
Ethics approval and consent to participate
: Informed consent was obtained from all participants by answering the questionnaire, and tick off “yes” to the question of linking survey data to registry data on sickness absence. The study was approved by the Regional Committee for Ethics in Medical Research (reference number: 2011/1577).
: Not applicable.
: The authors declare that they have no competing interests.