1. Department of Pneumology, Hôpital Erasme, Université Libre de Bruxelles, Brussels, Belgium
2. Department of Pneumology, Cliniques Universitaires Saint-Luc, Université Catholique de Louvain, Brussels, Belgium
3. Department of Pneumology, AZ Glorieux, Ronse, Belgium
4. Department of Thoracic Surgery, Hôpital Erasme, Université Libre de Bruxelles, Brussels, Belgium
5. Department of Pathology, Cliniques Universitaires Saint-Luc, Université Catholique de Louvain, Brussels, Belgium
6. Department of Pathology, Hôpital Erasme, Université Libre de Bruxelles, Brussels, Belgium