1. UMR 5797, Bordeaux University, 33170 Gradignan, France
2. UMR 5797, CENBG, IN2P3, CNRS, 33170 Gradignan, France
3. Department of Radiation Convergence Engineering, Yonsei University, 26493 Wonju, Korea
4. Department of Radiation Oncology, University of California San Francisco, San Francisco, California, 94143, USA
5. IRSN, DRPH/SDE, Av. de la division Leclerc, Fontenay-aux-Roses Cedex 92262, France
6. KEK, 1-1, Oho, Tsukuba, 305-0801 Ibaraki, Japan
7. Medical Physics Laboratory, University of Ioannina Medical School, 45110 Ioannina, Greece
8. UMR 1037 CRCT, Université Toulouse III-Paul Sabatier, 31037 Toulouse, France
9. UMR 1037 Inserm, 31037 Toulouse, France
10. Centre for Medical Radiation Physics, University of Wollongong, Wollongong, 2522 NSW, Australia
11. Proton Therapy Center, National Cancer Center, 10408 Goyang, Korea