Affiliation: | 1. Department of Infectious Diseases, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden;2. Department of Pediatrics, Institution of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden;3. Department of ENT, Head and Neck Surgery, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden;4. Department of ENT, Head and Neck Surgery, N?L Hospital, Trollh?ttan, Sweden;5. Department of Pediatrics, N?L Hospital, Trollh?ttan, Sweden |