1. Department of Pulmonary Medicine, Clinic of Occupational and Environmental MedicineUniversity Hospitals Leuven Leuven Belgium
2. Department of Public Health and Primary Care, Centre for Environment and HealthUniversity of Leuven Leuven Belgium
3. Department of PathologyUniversity Hospitals Leuven Leuven Belgium
4. IDEWEExternal Service for Prevention and Protection at Work Leuven Belgium
5. Department of Pulmonary Medicine, Unit for Interstitial Lung DiseasesUniversity Hospitals Leuven Leuven Belgium
6. Department of Earth and Environmental Science, GeologyUniversity of Leuven Leuven Belgium