Funding for this research was provided by:
AFA Försäkring (130081)
Received: 15 January 2019
Accepted: 27 January 2020
First Online: 12 March 2020
Ethics approval and consent to participate
: The study was approved by the Regional Ethics Committee in Lund, Sweden (No.2010/19). Written informed consent, to participate was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.