1. Department of Cardiothoracic Surgery; University Medical Center Groningen; University of Groningen; Groningen The Netherlands
2. Department of Thoracic Surgery; University Hospitals Leuven; Leuven Belgium
3. Nuffield Department of Surgical Sciences; Oxford Transplant Centre; University of Oxford; Oxford UK
4. Thoracic Department; Hospital Universitario Puerta de Hierro Majadahonda; Madrid Spain
5. Institute of Cellular Medicine; Newcastle University; Newcastle upon Tyne UK