1. Department of Pulmonary Medicine, Institut Clinic del Tórax, Hospital Clinic of Barcelona - Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), University of Barcelona - Ciber de Enfermedades Respiratorias (Ciberes), Barcelona, Spain
2. Department of Pneumonology, Sotiria General Hospital for Thoracic Diseases, Medical School, University of Athens, Barcelona, Spain
3. Fundació Clínic per la Recerca Biomèdica, Hospital Clínic de Barcelona, Barcelona, Spain