Netherlands Cancer Institute - Department of Radiation Oncology, Maastricht University, Catharina Hospital - Department of Radiation Oncology, Institute Verbeeten - Department of Radiation Oncology, UZ Gasthuisberg - Department of Radiation Oncology, Ghent University Hospital - Department of Radiation Oncology, Amsterdam University Medical Centers - Department of Radiation Oncology, Erasmus MC Cancer Institute - Department of Radiation Oncology, Antwerp University Hospital - Pulmonology & Thoracic Oncology, University of Groningen - Department of Radiation Oncology, Netherlands Cancer Institute - Department of Radiation Oncology, Netherlands Cancer Institute - Division of Psychosocial Research and Epidemiology, KU Leuven - Leuven Cancer Institute, Netherlands Cancer Institute - Division of Psychosocial Research and Epidemiology, Netherlands Cancer Institute - Neurology, Netherlands Cancer Institute - Department of Biometrics, Netherlands Cancer Institute - Department of Biometrics and Netherlands Cancer Institute - Division of Psychosocial Research and Epidemiology

Netherlands Cancer Institute - Department of Radiation Oncology, Radboud University Nijmegen - Radboud University Medical Center, Netherlands Cancer Institute - Department of Radiation Oncology, Netherlands Cancer Institute - Department of Radiation Oncology, Netherlands Cancer Institute - Department of Radiation Oncology, Netherlands Cancer Institute - Department of Radiation Oncology, Netherlands Cancer Institute and Netherlands Cancer Institute - Department of Radiation Oncology