1. Bioengineering Unit, Clinical Department, CNAO National Center for Oncological Hadrontherapy, Pavia, Italy
2. Radiotherapy Unit, Clinical Department, CNAO National Center for Oncological Hadrontherapy, Pavia, Italy
3. Medical Physics Unit, Clinical Department, CNAO National Center for Oncological Hadrontherapy, Pavia, Italy
4. CNAO National Center for Oncological Hadrontherapy, Pavia, Italy
5. European Institute of Oncology, Milan, Italy
6. Department of Electronics, Information and Bioengineering, Politecnico di Milano University, Milan, Italy