1. Department of Respiratory Diseases, CHU Liège, GIGA-Research, University of Liège, Liège, Belgium
2. Chest Department, Erasme University Hospital, Université Libre de Bruxelles, Brussels, Belgium
3. Department of Respiratory Medicine, University Hospital Vésale, Montigny-le-Tilleul, Belgium
4. Department of Pulmonary Medicine, Cliniques Universitaires St Luc, and Institute of Experimental and Clinical Research, Université Catholique de Louvain, Brussels, Belgium
5. Department of Respiratory Medicine, University Hospital Saint-Pierre, Université Libre de Bruxelles, Belgium
6. Respiratory Division, Universitair Ziekenhuis Brussel, Vrije Universiteit Brussel (VUB), Brussels, Belgium