1. Department of Laboratory Medicine; Medical Microbiology, Lund University; Malmö
2. Department of Laboratory Medicine; Lund University; Lund
3. Department of Clinical Sciences; Division of Otorhinolaryngology; Umeå University; Umeå
4. Department of Clinical Sciences; Division of Otorhinolaryngology; Head and Neck Surgery; Scania University Hospital, Lund University; Scania Sweden