Halvorsen, Inger http://orcid.org/0000-0002-5427-0300
Rø, Øyvind
Article History
Received: 1 December 2018
Accepted: 11 April 2019
First Online: 2 May 2019
Ethics approval and consent to participate
: The study was approved by the Regional Committee for Medical Research Ethics, South-East Norway (REK2014/2223). All participants provided written informed consent and, for former patients under 16 years old, parental consent.
: Not applicable
: The author declares that he has no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.