Avershina, Ekaterina http://orcid.org/0000-0001-9935-2804
Slangsvold, Silje
Simpson, Melanie Rae http://orcid.org/0000-0003-2763-6343
Storrø, Ola
Johnsen, Roar
Øien, Torbjørn
Rudi, Knut
Article History
Received: 30 August 2017
Accepted: 4 December 2017
First Online: 14 December 2017
Competing Interests
: The authors declare that they have no competing interests.