Østgård, L S G
Nørgaard, J M
Sengeløv, H
Severinsen, M
Friis, L S
Marcher, C W
Dufva, I H
Nørgaard, M
Article History
Received: 6 May 2014
Revised: 25 July 2014
Accepted: 28 July 2014
First Online: 5 August 2014
Competing interests
: The authors declare no conflict of interest.