1Infectious Diseases Unit, Department of Internal Medicine, Haukeland University Hospital, N-5021 Bergen, Norway, E-mail: BirgerLrum@gmail.com
2Influenza Centre and Jebsen Centre for Influenza vaccine research, Department of Clinical Sciences, University of Bergen, N-5021 Bergen, Norway, E-mail: BirgerLrum@gmail.com
3Department of Clinical Sciences, University of Bergen, N-5021 Bergen, Norway, E-mail: BirgerLrum@gmail.com
4Department of Research and Development, Centre of Infection Control, Haukeland University Hospital, N-5021 Bergen, Norway, E-mail: BirgerLrum@gmail.com
5Department of Research and Development, Centre for Clinical Research, Haukeland University Hospital, N-5021 Bergen, Norway, E-mail: BirgerLrum@gmail.com