Funding for this research was provided by:
South Eastern Regional Health Authority (2013001)
Akershus University Hospital (2629014)
Received: 13 July 2018
Accepted: 9 October 2018
First Online: 17 October 2018
Ethics approval and consent to participate
: The study was approved by the Regional Committee for Medical Research Ethics and the Norwegian Data Protection Authorities. The participants received written and verbal information about the project and inclusion was based on informed consent. No reimbursement for participation was given.
: 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.