1. Department of Thoracic and Esophageal Surgery, Marseille
2. Department of Thoracic Surgery, Leuven, Belgium
3. Department of Digestive and Oncological Surgery, Lille, France
4. Department of Surgery and Amsterdam Cancer Center, Amsterdam
5. Department of Surgery, Erasmus University Medical Center, Rotterdam, the Netherlands
6. Department of Surgery, Cologne, Germany
7. Department of Surgery, Karolinska Institute, Stockholm, Sweden