1. University of Tromsø, Faculty of Health Sciences, Institute of Medical Biology, NO-9037 Tromsø, Norway
2. Department of Medical Genetics, University Hospital of North Norway, NO-9038 Tromsø, Norway
3. University of Tromsø, Faculty of Health Sciences, Institute of Clinical Biology, NO-9037 Tromsø, Norway
4. Department of Medical Microbiology, Trondheim University Hospital, NO-7489 Trondheim, Norway
5. Institute of Laboratory Medicine, Children’s and Women’s Health, Norwegian University of Science and Technology, Trondheim, Norway
6. Division 12 Measles, Mumps, Rubella and Viruses Affecting Immunocompromised Patients, Robert Koch Institute, Berlin, Germany