1. Department of Otorhinolaryngology (ORL); Helsingborg Hospital; Helsingborg Sweden
2. Department of ORL-Head and Neck Surgery; Skåne University Hospital; Lund Sweden
3. Department of Laboratory Medicine, Lund, Section of Medical Microbiology; Lund University; Lund Sweden
4. Department of Immunotechnology; Lund University; Lund Sweden
5. Department of ORL-Head and Neck Surgery, Royal Brisbane and Women's Hospital, School of Medicine; University of Queensland; Brisbane Australia