Leiden University, Medical Center (LUMC), Department of Pathology, University Hospital Zurich - Department of Pathology and Molecular Pathology, Leiden University, Medical Center (LUMC), Department of Pathology, Leiden University - Department of Vascular and Molecular Imaging, Leiden University, Medical Center (LUMC), Department of Pathology, Medisch Spectrum Twente - Department of Radiation Oncology, Laboratorium Pathologie Oost-Nederland (LabPON) - Department of Pathology, Laboratorium Pathologie Oost-Nederland (LabPON) - Department of Pathology, University Medical Center Utrecht - Department of Radiation Oncology, Maastricht University - Department of Radiation Oncology (MAASTRO), Erasmus University Medical Center Rotterdam - Department of Radiation Oncology, Radiotherapiegroep - Department of Radiation Oncology, Leiden University - Department of Radiation Oncology, Government of the United Kingdom - Department of Clinical Oncology, Barts Health NHS Trust, Department of Cellular Pathology, Peter MacCallum Cancer Centre - Department of Medical Oncology, University of Toronto - Department of Medical Oncology and Hematology, Université Paris XI Sud - Gustave Roussy Cancer Campus, University of Groningen - Department of Obstetrics and Gynecology, Leiden University, Medical Center (LUMC), Department of Pathology, Leiden University - Department of Radiation Oncology, Leiden University - Department of Radiation Oncology, University Hospital Zurich - Department of Pathology and Molecular Pathology and Leiden University, Medical Center (LUMC), Department of Pathology