1. Danish Centre for Particle Therapy, Aarhus University Hospital, Aarhus, Denmark
2. Department of Oncology, Oslo University Hospital, Oslo, Norway
3. Institute for Cancer Genetics and Informatics, Oslo University Hospital, Oslo, Norway
4. Department of Oncology, Karolinska University Hospital, Stockholm, Sweden
5. Department of Hematology, Oncology and Radiation Physics, Skane University Hospital, Lund, Sweden
6. Department of Medical Physics, National Cancer Institute, Vilnius, Lithuania
7. Department of Oncology, Aarhus University Hospital, Aarhus, Denmark
8. Department of Oncology and Radiotherapy, Oulu University Hospital, Oulu, Finland
9. Department of Oncology, Rigshospital, Copenhagen University Hospital, Copenhagen, Denmark
10. West German Proton Therapy Centre Essen, Essen University Hospital, Essen, Germany
11. Department of Oncology, University Hospital of North Norway, Tromsø, Norway
12. Department of Oncology, Uppsala University Hospital, Uppsala, Sweden
13. Department of Immunology, Genetics and Pathology, Experimental and Clinical Oncology, Uppsala University Hospital, Uppsala, Sweden
14. Department of Particle Therapy, University Hospital Essen, Essen, Germany
15. Department of External Beam Radiotherapy, National Cancer Institute, Vilnius, Lithuania
16. Department of Oncology, Helsinki University Hospital, Helsinki, Finland
17. West German Cancer Center (WTZ), German Cancer Consortium (DKTK), Essen, Germany