Funding for this research was provided by:
Research Council of Norway (226275)
Received: 26 October 2019
Accepted: 20 May 2020
First Online: 3 June 2020
Ethics approval and consent to participate
: The challenge trial was approved by the Food and Safety Authority in Norway, Department for National Assignments (FOTS ID: 8137–15/180369), which conforms to the Guide for the Care and Use of Laboratory Animals published by the US National Institutes of Health (NIH Publication 85–23, revised 1996).
: Not applicable.
: No potential conflicts of interest.