Marvig, Rasmus Lykke http://orcid.org/0000-0002-5267-3173
Sommer, Lea Mette
Molin, Søren
Johansen, Helle Krogh
Article History
Received: 24 February 2014
Accepted: 27 October 2014
First Online: 17 November 2014
Competing interests
: The authors declare no competing financial interests.