1. Pleural Medicine Unit, Department of Internal Medicine; Arnau de Vilanova University Hospital; Lleida Spain
2. Institute for Biomedical Research in Lleida Dr Pifarré Foundation, IRBLLEIDA; Lleida Spain
3. Department of Radiology; Arnau de Vilanova University Hospital; Lleida Spain
4. Department of Internal Medicine; Vall d'Hebron University Hospital; Barcelona Spain
5. Department of Radiology; Vall d'Hebron University Hospital; Barcelona Spain
6. Division of Allergy, Pulmonary and Critical Care; Vanderbilt University Medical Center; Nashville Tennessee USA