Christoffersen, T. http://orcid.org/0000-0001-9704-1711
Emaus, N.
Dennison, E.
Furberg, A.-S.
Gracia-Marco, L.
Grimnes, G.
Nilsen, O. A.
Vlachopoulos, D.
Winther, A.
Ahmed, L. A.
Funding for this research was provided by:
Helse Nord RHF (SFP1160-14)
Article History
Received: 5 June 2017
Accepted: 2 November 2017
First Online: 16 November 2017
Compliance with ethical standards
: The study was approved by the Norwegian Data Protection Authority (reference number 2009/1282) and by the Regional Committee of Medical and Health Research Ethics (reference number 2011/1702/REKnord).
: None.