Hansen, Torben Frøstrup
Andersen, Rikke Fredslund
Olsen, Dorte Aalund
Sørensen, Flemming Brandt
Jakobsen, Anders
Article History
Received: 7 November 2016
Accepted: 12 April 2017
First Online: 24 May 2017
Competing Interests
: The authors declare that they have no competing interests.