Nilsen, Jeannette
Bern, Malin
Sand, Kine Marita Knudsen
Grevys, Algirdas
Dalhus, Bjørn
Sandlie, Inger
Andersen, Jan Terje
Article History
Received: 26 July 2018
Accepted: 6 September 2018
First Online: 2 October 2018
Competing Interests
: The authors declare no competing interests.