Funding for this research was provided by:
Norwegian health region West
Received: 15 April 2020
Accepted: 17 August 2020
First Online: 28 August 2020
Ethics approval and consent to participate
: Subsequent to providing informed consent, each individual included in the present work donated anonymized blood samples for research purposes. This was done in accordance with Norwegian legislation at the time of sample collection (late 1990s).
: Not applicable
: The authors declare no competing interests.