Funding for this research was provided by:
Livsvitenskap, Universitetet i Oslo (NA)
Norges Forskningsråd (284983)
Helse Sør-Øst RHF (2016006)
Received: 16 November 2019
Accepted: 19 May 2020
First Online: 1 June 2020
Ethics approval and consent to participate
: The study was approved by the Regional Committee for Medical Research Ethics (Oslo, Norway) (REC approval no: 2013/624, 2016/2247).
: Not applicable.
: The authors declare that they have no competing interests.