Ingthorsson, S
Andersen, K
Hilmarsdottir, B
Maelandsmo, G M
Magnusson, M K
Gudjonsson, T
Article History
Received: 15 July 2015
Revised: 11 November 2015
Accepted: 14 November 2015
First Online: 21 December 2015
Competing interests
: The authors declare no conflict of interest.