Mørk, N
Kofod-Olsen, E
Sørensen, K B
Bach, E
Ørntoft, T F
Østergaard, L
Paludan, S R
Christiansen, M
Mogensen, T H
Article History
Received: 30 June 2015
Revised: 12 September 2015
Accepted: 15 September 2015
First Online: 29 October 2015
Competing interests
: The authors declare no conflict of interest.