1. Danish Centre for Particle Therapy, Aarhus University Hospital, Aarhus, Denmark
2. Department of Oncology, Aarhus University Hospital, Aarhus, Denmark
3. Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
4. Department of Radiation Oncology, Advanced Centre for Treatment Research and Education in Cancer, Tata Memorial Centre, Homi Bhabha National Institute, Navi Mumbai, India
5. Department of Radiation Oncology, University Medical Centre Utrecht, Utrecht, CX, The Netherlands
6. Department of Radiotherapy, Erasmus MC Cancer Institute, University Medical Center Rotterdam, The Netherlands
7. Department of Radiation Oncology, Comprehensive Cancer Center, Medical University of Vienna, Vienna, Austria