1. Unit of Pathological Anatomy, University Hospital of Pisa, Via Roma 67, 56126 Pisa, Italy
2. Department of Surgical, Medical, Molecular Pathology and Critical Area, University of Pisa, Via Savi 10, 56126 Pisa, Italy
3. Endoscopic Section of Pneumology, University Hospital of Pisa, Via Paradisa 2, 56124 Pisa, Italy
4. Unit of Pneumology, University Hospital of Pisa, Via Paradisa 2, 56124 Pisa, Italy