1. OncoRay–National Center for Radiation Research in Oncology, Faculty of Medicine and University Hospital Carl Gustav Carus, Technische Universität Dresden, Helmholtz-Zentrum Dresden–Rossendorf, 01309 Dresden, Germany
2. Division of Medical Radiation Physics, Institute of Radiooncology–OncoRay, Helmholtz-Zentrum Dresden–Rossendorf, 01328 Dresden, Germany
3. Ion Beam Applications SA, 1348 Louvain-la-Neuve, Belgium
4. Division of Medical Radiation Physics, Department of Radiotherapy and Radiation Oncology, Faculty of Medicine and University Hospital Carl Gustav Carus, Technische Universität Dresden, 01307 Dresden, Germany