1. Department of Thoracic Surgery and Lung Transplantation, Hospital Universitario Vall d’Hebron , Barcelona, Spain
2. Department of Thoracic surgery, Hospital Universitario Miguel Servet and Hospital Clínico Lozano Blesa , Zaragoza, Spain
3. Laparoscopy Unit, Jesús Usón Minimally Invasive Surgery Centre , Cáceres, Spain