1. Department of Otorhinolaryngology Hospital Josina Machel Luanda Angola
2. Faculty of Medicine Agostinho Neto University Luanda Angola
3. Department of Otorhinolaryngology Helsinki University Hospital Helsinki Finland
4. Faculty of Medicine University of Helsinki Helsinki Finland
5. ENT‐outpatient Department Slottsstadens Läkarhus Malmö Sweden
6. Clinical Microbiology Department of Translational Medicine Faculty of Medicine Lund University Malmö Sweden
7. Department of Pediatrics Helsinki University Hospital Helsinki Finland