Skjørringe, Tina
Amstrup Pedersen, Per
Salling Thorborg, Sidsel
Nissen, Poul
Gourdon, Pontus
Birk Møller, Lisbeth
Article History
Received: 5 December 2016
Accepted: 6 March 2017
First Online: 7 April 2017
Competing Interests
: The authors declare that they have no competing interests.