1. The Danish Lung Cancer Registry, Department of Thoracic Surgery, Odense University Hospital , Odense, Denmark;
2. Odense Patient Data Exploratory Network (OPEN), Odense University Hospital/Department of Clinical Research, University of Southern Denmark , Odense, Denmark;
3. The Danish Lung Cancer Group, Department of Pulmonary Medicine, Aarhus University Hospital , Aarhus, Denmark;
4. Institute of Applied Economics and Health Research , Copenhagen, Denmark