1. Department of Occupational Diseases, Medical Faculty, Medical University of Sofia, Sofia, Bulgaria
2. Pneumology Department, Hospital Universitari Vall d´Hebron/Vall d’Hebron Institut de Recerca (VHIR), Vall d’Hebron Hospital Campus; CIBER de Enfermedades Respiratorias (CIBERES), Barcelona, Spain
3. ArtiQ NV, Leuven, Belgium
4. Centre for Molecular Bacteriology and Infection, Imperial College London, UK
5. Department of Respiratory Diseases, Medical Faculty, Medical University of Sofia, Sofia, Bulgaria