Helm, Thea
Varsi, Kristin
Fløtre, Christina Herland
Lund, Agnethe
Svingen, Gard Frodahl Tveitevåg
Ueland, Per Magne
Bjørke-Monsen, Anne-Lise
Article History
Received: 5 December 2017
Accepted: 30 July 2018
First Online: 15 August 2018
Competing Interests
: The authors declare no competing interests.