1. Institute for Lung Diseases of Vojvodina Thoracic Surgery Clinic Sremska Kamenica Serbia
2. Sheffield Teaching Hospitals NHS Foundation Trust Sheffield UK
3. Basildon and Thurrock University Hospitals NHS Foundation Trust Basildon UK
4. South Tees Hospitals NHS Foundation Trust The James Cook University Hospital Middlesbrough UK
5. Liverpool Heart And Chest Hospital NHS Foundation Trust Liverpool UK
6. Bristol Royal Infirmary University Hospitals Bristol NHS Foundation Trust Bristol UK
7. Royal Papworth Hospital NHS Foundation Trust Cambridge UK
8. The Christie NHS Foundation Trust Manchester UK
9. Division of Surgery Royal Free London NHS Foundation Trust UCL London UK
10. Derriford Hospital University Hospitals Plymouth NHS Trust Plymouth UK
11. The Royal Wolverhampton NHS Trust New Cross Hospital Wolverhampton UK
12. Surgical & Interventional Trials Unit (SITU) University College London London UK
13. Centre for Trials Research Cardiff University Cardiff UK
14. MRC Biostatistics Unit Cambridge UK
15. Clinical Operational Research Unit University College London London UK