1 Division of Thoracic Surgery, Department of Surgical Medical Molecular Pathology and Critical Care, University Hospital of Pisa, Via Paradisa 2, 56124 Pisa, Italy. Electronic address: pieberto@hotmail.com.
2 Division of Thoracic Surgery, Department of Surgical Medical Molecular Pathology and Critical Care, University Hospital of Pisa, Via Paradisa 2, 56124 Pisa, Italy.