1. Department of Clinical Oncology, Biomedical Research Institute of Salamanca (IBSAL), University Hospital of Salamanca, University of Salamanca, 37007 Salamanca, Spain
2. Department of Thoracic Surgery, University Hospital of Salamanca, 37007 Salamanca, Spain
3. Department of Pathology, Biomedical Research Institute of Salamanca (IBSAL), University Hospital of Salamanca, 37007 Salamanca, Spain
4. Department of Pulmonology, University Hospital of Salamanca, 37007 Salamanca, Spain