Mork, Randi
Falkenberg, Helle K.
Fostervold, Knut Inge
Thorud, Hanne-Mari Schiøtz http://orcid.org/0000-0002-4045-0909
Funding for this research was provided by:
Norwegian Extra Foundation for Health and Rehabilitation / Spine Association (2011/2/0036)
Article History
Received: 30 November 2018
Accepted: 30 June 2019
First Online: 8 July 2019
Compliance with ethical standards
:
: The authors declare no conflict of interest.
: The study protocol was approved by the Regional Committee for Medical and Health Research Ethics, Norway (2013/610), and followed the tenets of the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: All participants received verbal and written information about the study, and written informed consent was obtained from all participants.