Affiliation: | 1. Department of Pediatrics, Turku University Hospital, , Turku, Finland;2. Department of Virology, University of Turku, , Turku, Finland;3. Department of Virology, Haartman Institute, University of Helsinki, , Helsinki, Finland;4. Department of Emergency Medicine and Division of Rheumatology, Allergy and Immunology, Department of Medicine, Massachusetts General Hospital, Harvard Medical School, , Boston, MA, USA |