1. Department of Cardio-thoracic surgery, Erasmus University Medical Center, Rotterdam, The Netherlands
2. Wales Cancer Trials Unit, Cardiff University, Cardiff, UK
3. Clinical Operational Research Unit, University College London, London, UK
4. Hospital Alemão Oswaldo Cruz, São Paulo, Brazil
5. Department of Thoracic Oncology, Papworth Hospital, Cambridge, UK
6. Imperial College Trials Unit & Division of Surgery, Imperial College London, London, UK