Hveem, Tarjei S
Kleppe, Andreas
Vlatkovic, Ljiljana
Ersvær, Elin
Wæhre, Håkon
Nielsen, Birgitte
Kjær, Marte Avranden
Pradhan, Manohar
Syvertsen, Rolf Anders
Nesheim, John Arne
Liestøl, Knut
Albregtsen, Fritz
Danielsen, Håvard E
Article History
Received: 15 January 2016
Revised: 10 March 2016
Accepted: 15 March 2016
First Online: 28 April 2016
Competing interests
: The funding sponsors had no role in the study design, collection, analysis or interpretation of data, nor in writing the report.
: The authors declare no conflict of interest.