1. The University of Liverpool Cancer Research Centre; Liverpool UK
2. Department of Pulmonary Medicine Lievensberg Hospital; Belgium
3. Department of Thoracic Surgery; University of Copenhagen; Copenhagen Denmark
4. Department of Thoracic Surgery; European Institute of Oncology; Milan Italy
5. Unit of Clinical and Descriptive Epidemiology; ISPO; Florence Italy
6. Division of Cancer Epidemiology; German Cancer Research Center; Heidelberg Germany
7. Department of Thoracic Surgery; Instituto Clinico Humanitas; Milan Italy
8. Center for Medical Imaging; University Medical Center Groningen; Netherlands
9. Department of Public Health; Erasmus MC; Rotterdam The Netherlands