Authors: Alan Dal Pra1, Piet Dirix2, Vincent Khoo3, Christian Carrie4, Cesare Cozzarini5, Valérie Fonteyne6, Pirus Ghadjar7, Alfonso Gomez-Iturriaga8, Valeria Panebianco9, Almudena Zapatero10, Alberto Bossi11, Thomas Wiegel12
1University of Miami, Department of Radiation Oncology , Miami, USA; 2Iridium Network, Department of Radiation Oncology, Antwerp, Belgium; 3The Royal Marsden NHS Foundation Trust and Institute of Cancer Research, Department of Clinical Oncology, London, United Kingdom; 4Leon Bérard Center, Department of Radiotherapy, Lyon, France; 5IRCCS San Raffaele Scientific Institute, Department of Radiotherapy, Milan, Italy; 6Ghent University Hospital, Department of Radiation Oncology, Ghent, Belgium; 7Universitätsmedizin Berlin, Department of Radiation Oncology, Berlin, Germany; 8Biocruces Health Research Institute, Cruces University Hospital, Department of Radiation Oncology, Barakaldo, Spain; 9Sapienza University of Rome, Department of Radiological Sciences, Oncology and Pathology, Rome, Italy; 10Hospital Universitario de La Princesa, Instituto de Investigación Sanitaria IP, Department of Radiation Oncology, Madrid, Spain; 11Centre Charlebourg, Department of Radiation Oncology, La Garenne Colombe, France; 12University Hospital Ulm, Department of Radiation Oncology, Ulm, Germany