Funding for this research was provided by:
Helse Sør-Øst RHF (25479)
Received: 20 March 2020
Accepted: 14 January 2021
First Online: 1 February 2021
Ethics approval and consent to participate
: The study was approved by the Regional Committee for Medical and Health Research Ethics in the South East Health Region of Norway (reference number 2014/1167).
: Not applicable.
: The authors declare that they have no competing interests.