1. UMR 5797, Bordeaux University, F-33170 Gradignan, France
2. UMR 5797, CENBG, IN2P3, CNRS, F-33170 Gradignan, France
3. Department of Radiation Convergence Engineering, Yonsei University, Wonju, South Korea
4. UMR 1037 CRCT, Université Toulouse III-Paul Sabatier, Toulouse, France
5. UMR 1037 Inserm, Toulouse, France
6. Medical Physics Laboratory, University of Ioannina Medical School, 45110 Ioannina, Greece
7. Centre for Medical Radiation Physics, University of Wollongong, Wollongong, New South Wales, Australia
8. Proton Therapy Center, National Cancer Center, Goyang, South Korea