1. Department of Respiratory Medicine, Ghent University Hospital, Ghent, Belgium
2. Department of Internal Medicine, Ghent University, Ghent, Belgium
3. Department of Respiratory Medicine, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands
4. Department of Sustainable Organic Chemistry and Technology, EnVOC Research Group, Ghent University, Ghent, Belgium
5. Department of Mathematical Modelling, Statistics and Bio-Informatics, Ghent University, Ghent, Belgium
6. Occupational Health Service, Eternit N.V., Kapelle-op-den-Bos, Belgium
7. Department of Respiratory Diseases, KU Leuven, University Hospitals Leuven, Leuven, Belgium
8. Thoracic Oncology/MOCA, Antwerp University Hospital, Edegem, Belgium