1 Department of General Thoracic Surgery, Fondazione Policlinico Universitario "Agostino Gemelli" IRCCS, Università Cattolica del Sacro Cuore, Rome, Italy.
2 Department of Thoracic Surgery, Maggiore Teaching Hospital, Bologna, Italy.
3 Competence Center of Thoracic Surgery, Department of Surgery, Charité-Universitätsmedizin Berlin, Berlin 10117, Germany.