1. Department of Documentation and Quality, Danish Cancer Society, Copenhagen Ø, Denmark;
2. Department of Respiratory Diseases and Allergy, Aarhus University Hospital, Aarhus, Denmark;
3. Oncology Clinic, Vaasa Central Hospital, Vaasa, Finland;
4. Faculty of Health, Aarhus University, Aarhus C, Denmark;
5. Danish Cancer Society Research Center, Copenhagen Ø, Denmark