Larsen, M. A. http://orcid.org/0000-0001-9398-6996
Isaksen, V. T.
Paulssen, E. J.
Goll, R.
Florholmen, J. R.
Article History
Received: 15 May 2019
Accepted: 26 September 2019
First Online: 11 October 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: The study was approved by The Regional Committee for Medical and Health Research Ethics of Northern Norway (2007, ID: 200704595-10/MRO/400) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The data bank approved by Norwegian Social Science Data Services (ID: 2206), registered on the 15th of April 2008.
: Informed consent was obtained from all individual participants included in the study.