Gunge, V B
Andersen, I
Kyrø, C
Hansen, C P
Dahm, C C
Christensen, J
Tjønneland, A
Olsen, A
Article History
Received: 7 May 2016
Revised: 25 September 2016
Accepted: 28 December 2016
First Online: 1 March 2017
Competing interests
: The authors declare no conflict of interest.