Funding for this research was provided by:
EkstraStiftelsen Helse og Rehabilitering (Stiftelsen Dam) (2005/FO5107)
Received: 31 May 2019
Accepted: 24 September 2019
First Online: 28 November 2019
Ethics approval and consent to participate
: The ROSA 4 study was approved by the Regional Ethical Committee which had given permission to conduct the study without consent to participate. The committee’s reference number was 2014/1374/REK vest.
: Not applicable.
: The authors declare that they have no competing interests.