1. K. G. Jebsen Centre for Influenza Vaccine Research, University of Oslo and Oslo University Hospital, Oslo, Norway
2. Institute of Clinical Medicine, University of Oslo and Oslo University Hospital, Oslo, Norway
3. Influenza Centre, Department of Clinical Science, University of Bergen, Bergen, Norway
4. Department of Research and Development, Haukeland University Hospital, Bergen, Norway
5. Centre for Immune Regulation, University of Oslo, Oslo, Norway