Funding for this research was provided by:
Helse Sør-Øst RHF (2013087, 2016049, 2017025, 2018075, 2017069)
Article History
Received: 3 April 2020
Accepted: 26 June 2020
First Online: 5 July 2020
Compliance with ethical standards
: Prior to participation, all participants received a brochure with a description of the study, and written informed consent was collected. The study was conducted in accordance with the Declaration of Helsinki and received ethical approval from the Regional Committee for Medical and Health Research Ethics in South-Eastern Norway (2013/601).
: The authors declare that they have no conflict of interest.