Institution: | 1. Valio Ltd, , Helsinki, Finland;2. Institute of Biomedicine, University of Helsinki, , Helsinki, Finland;3. Virology Unit, Department of Infectious Disease Surveillance and Control, National Institute for Health and Welfare (THL), , Helsinki, Finland;4. Department of Virology, Haartman Institute, University of Helsinki, , Helsinki, Finland;5. Medcare Foundation, , ??nekoski, Finland;6. Department of Otorhinolaryngology, Helsinki University Central Hospital and University of Helsinki, , Helsinki, Finland |