Kleppang, Annette Løvheim
Hartz, Ingeborg
Thurston, Miranda
Hagquist, Curt
Article History
Received: 12 January 2018
Accepted: 23 April 2018
First Online: 2 May 2018
Conflict of interest
: The authors declare that they have no conflict of interest.
: The study was assessed by the Regional Committee for Medical Research Ethics and approved by the Norwegian Data Protection Authority.