Andersen, L B B
Pipper, C B
Trolle, E
Bro, R
Larnkjær, A
Carlsen, E M
Mølgaard, C
Michaelsen, K F
Article History
Received: 15 August 2014
Revised: 7 October 2014
Accepted: 10 October 2014
First Online: 3 December 2014
Competing interests
: The authors declare no conflict of interest.