Starheim, K K
Holien, T
Misund, K
Johansson, I
Baranowska, K A
Sponaas, A-M
Hella, H
Buene, G
Waage, A
Sundan, A
Bjørkøy, G
Article History
Received: 27 April 2016
Accepted: 3 May 2016
First Online: 15 July 2016
Competing interests
: The authors declare no conflict of interest.