Therkildsen, Christina
Ladelund, Steen
Smith-Hansen, Lars
Lindberg, Lars Joachim
Nilbert, Mef
Article History
Received: 15 March 2017
Revised: 7 July 2017
Accepted: 5 September 2017
First Online: 24 October 2017
Competing interests
: The authors declare no conflict of interest.