1. Department of Virology, University of Helsinki, Helsinki, Finland
2. Department of Biological and Environmental Science, University of Jyväskylä, Jyväskylä, Finland
3. Nanoscience Center, University of Jyväskylä, Jyväskylä, Finland
4. Department of Microbiology, Molecular Genetics and Immunology, University of Kansas Medical Center, Kansas City, Kansas, USA
5. Helsinki University Hospital, Helsinki, Finland
6. Department of Otorhinolaryngology-Head and Neck Surgery, Helsinki University Hospital, Helsinki, Finland
7. University of Helsinki, Helsinki, Finland