1 Thoracic Department, Division of Thoracic Surgery, Istituto Nazionale Tumori, Istituto di Ricovero e Cura a Carattere Scientifico, Fondazione Pascale, Naples, Italy. Electronic address: g.rocco@istitutotumori.na.it.
2 Department of Thoracic Surgery, University Hospital Zurich, Zurich, Switzerland.