Funding for this research was provided by:
St. Olavs Hospital Universitetssykehuset i Trondheim
Confederation of Norwegian Enterprise, Working Environment Fund. (S-2832)
Article History
Received: 10 December 2018
Accepted: 5 September 2019
First Online: 17 September 2019
Compliance with ethical standards
:
: The authors declare that they have no conflicts of interests.
: The study protocol was approved by the Regional Committee for Medical Research Ethics in central Norway (Approval No. 2008/2527). Signed informed consents were obtained from each participant.