Received: 13 January 2020
Accepted: 30 March 2020
First Online: 27 May 2020
Ethics approval and consent to participate
: The project will be conducted in accordance with the Helsinki Declaration. We obtain informed, written consent from all participants in the study. The consent also covers collection and use of blood samples in research. These are available from the corresponding author on reasonable request. The procedures regarding consent and storing biological samples in a Biobank are approved by the Regional Committee for Medical Research Ethics in Middle Norway REK (2018/957).
: Not applicable for the study protocol.
: The authors declare that they have no competing interests.