Borgeraas, Heidi
Hertel, Jens Kristoffer
Svingen, Gard Frodahl Tveitevåg
Seifert, Reinhard
Pedersen, Eva Kristine Ringdal
Schartum-Hansen, Hall
Hjelmesæth, Jøran
Nygård, Ottar
Article History
Received: 21 November 2013
Accepted: 16 May 2014
First Online: 21 May 2014