Funding for this research was provided by:
EkstraStiftelsen Helse og Rehabilitering (2017/Hel-164176)
Text and Data Mining valid from 2019-12-01
Received: 6 February 2019
Accepted: 21 November 2019
First Online: 5 December 2019
Ethics approval and consent to participate
: This project was planned in accordance with the Helsinki Declaration (ref) and approved by the Regional Committees for Medical and Health Research Ethics, Norway (Dnr. 2017/356). Informed written consent was obtained from all participants.
: Not applicable
: The authors declare that they have no competing interests.