1. Department of Otorhinolaryngology, Head and Neck Surgery; University Hospitals Leuven; Leuven Belgium
2. Laboratory of Clinical Immunology; Department of Microbiology and Immunology; KU Leuven; Leuven Belgium
3. Department of Otorhinolaryngology; Academic Medical Centre; Amsterdam the Netherlands
4. Research Unit of Lung Toxicology; Department of Public Health and Primary Care; KU Leuven; Leuven Belgium