1. Pleural Diseases Unit; Department of Internal Medicine; Arnau de Vilanova University Hospital, Biomedical Research Institute of Lleida; Lleida; Spain
2. Pleural Diseases Unit; Laboratory Medicine; Arnau de Vilanova University Hospital, Biomedical Research Institute of Lleida; Lleida; Spain
3. Division of Allergy; Pulmonary and Critical Care Medicine; Vanderbilt University Medical Center; Nashville; Tennessee; USA