Funding for this research was provided by:
Norske Legeforening (#16/2077)
Article History
Received: 27 November 2017
Accepted: 25 May 2018
First Online: 21 June 2018
Ethics approval and consent to participate
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.