18 Pole of Pneumology, ENT, and Dermatology (PNEU), Institut de Recherche Expérimentale et Clinique (IREC), Université Catholique de Louvain (UCLouvain), Brussels, Belgium.
19 Respiratory Oncology Unit, University Hospitals KU Leuven, Leuven, Belgium.
20 Department of Pulmonology, Cliniques Universitaires Saint-Luc, Brussels, Belgium.
21 Department of Respiratory Medicine, Ghent University, Ghent, Belgium.