Hrolfsdottir, L
Rytter, D
Olsen, S F
Bech, B H
Maslova, E
Henriksen, T B
Halldorsson, T I
Article History
Received: 28 March 2014
Revised: 7 August 2014
Accepted: 6 September 2014
First Online: 9 October 2014
Competing interests
: The authors declare no conflict of interest.