Wargelius, Anna
Leininger, Sven
Skaftnesmo, Kai Ove
Kleppe, Lene
Andersson, Eva
Taranger, Geir Lasse
Schulz, RĂ¼diger W
Edvardsen, Rolf B
Article History
Received: 15 September 2015
Accepted: 20 January 2016
First Online: 18 February 2016
Competing interests
: The authors declare no competing financial interests.