Pottegård, Anton
Ennis, Zandra Nymand
Hallas, Jesper
Jensen, Boye L
Madsen, Kirsten
Friis, Søren
Article History
Received: 22 September 2015
Revised: 18 December 2015
Accepted: 26 December 2015
First Online: 11 February 2016
Competing interests
: The authors declare no conflict of interest.