Ramirez-Llodra, Eva
Rinde, Eli
Gundersen, Hege
Christie, Hartvig
Fagerli, Camilla With
Fredriksen, Stein
Gitmark, Janne Kim
Norling, Karl
Walday, Mats Gunnar
Norderhaug, Kjell Magnus
Article History
Received: 5 January 2016
Accepted: 11 March 2016
First Online: 30 March 2016
Competing interests
: The authors declare no competing financial interests.