,
Njølstad, T S
Trovik, J
Hveem, T S
Kjæreng, M L
Kildal, W
Pradhan, M
Marcickiewicz, J
Tingulstad, S
Staff, A C
Haugland, H K
Eraker, R
Oddenes, K
Rokne, J A
Tjugum, J
Lode, M S
Amant, F
Werner, H M
Salvesen, H B
Danielsen, H E
Article History
Received: 5 December 2014
Revised: 24 February 2015
Accepted: 8 March 2015
First Online: 21 April 2015
Competing interests
: The authors declare no conflict of interest.