Fjørtoft, Helene Børretzen https://orcid.org/0000-0001-8195-0582
Besnier, Francois
Stene, Anne
Nilsen, Frank
Bjørn, Pål Arne
Tveten, Ann-Kristin
Finstad, Bengt
Aspehaug, Vidar
Glover, Kevin Alan
Article History
Received: 28 March 2017
Accepted: 13 October 2017
First Online: 27 October 2017
Competing Interests
: The authors declare that they have no competing interests.