Tryggvadottir, E A
Medek, H
Birgisdottir, B E
Geirsson, R T
Gunnarsdottir, I
Article History
Received: 28 November 2014
Revised: 15 July 2015
Accepted: 22 July 2015
First Online: 9 September 2015
Competing interests
: The authors declare no conflict of interest.