1. Northern Finland Laboratory Centre; Oulu Finland
2. Department of Infectious Disease Surveillance and Control; National Institute for Health and Welfare; Helsinki Finland
3. Department of Otorhinolaryngology; Kainuu Central Hospital; Kajaani Finland
4. Department of Vaccination and Immune Protection; National Institute for Health and Welfare; Oulu Finland
5. Department of Medical Microbiology and Immunology; Institute of Diagnostics, Oulu University; Oulu Finland
6. Department of Children, Young People and Families; National Institute for Health and Welfare; Oulu Finland