Herbert Decaluwé1, Christophe Dooms1. 1. 1 Department of Thoracic Surgery, University Hospitals KU Leuven, Leuven, Belgium ; 2 Department of Clinical and Experimental Medicine, KU Leuven, Leuven, Belgium ; 3 Department of Respiratory Diseases, University Hospitals KU Leuven, Leuven, Belgium.