Avershina, Ekaterina
Larsen, Marte Gro
Aspholm, Marina
Lindback, Toril
Storrø, Ola
Øien, Torbjørn
Johnsen, Roar
Rudi, Knut
Article History
Received: 17 June 2019
Accepted: 22 January 2020
First Online: 4 February 2020
Competing interests
: The authors declare no competing interests.