1 Department of Thoracic Surgery and Thoracic Endoscopy, Ruhrlandklinik, West German Lung Center, University Hospital Essen, University Duisburg-Essen Essen, Germany.
2 Department of Vascular Surgery, General Hospital of Vlore, Vlore, Albania.
3 Department of General Surgery, University of Medicine, Tirana, Tirana, Albania.
4 Department of Thoracic Surgery, Asklepios Lung Clinic Munich-Gauting, Gauting, Germany.
5 Department of General and Visceral Surgery, Marienhospital Stuttgart, Stuttgart, Germany.
6 Department of Pulmonology, Internal Medicine II, Vienna University Hospital, Vienna, Austria.
7 Department of Thoracic Surgery, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland.
8 Department of Cardiothoracic and Vascular Surgery, WestpfalzKlinikum, Kaiserslautern, Germany.
9 Department of General Surgery, Patras University Hospital, Patras, Greece.
10 Department of Cardiothoracic Surgery, Patras University Hospital, Patras, Greece.
11 Department of Oncology, General University Hospital of Patras, Patras, Greece.
12 Department of Surgery, General Hospital of Lamia, Lamia, Greece.