1. Division of Radiation Oncology, European Institute of Oncology, Milan, Italy
2. Department of Oncology and Hemato-oncology, University of Milan, Milan, Italy
3. Division of Radiology, European Institute of Oncology, Milan, Italy
4. Unit of Medical Physics, European Institute of Oncology, Milan, Italy
5. Department of Electronics, Information and Bioengineering, Politecnico di Milano, Milan, Italy
6. Bioengineering Unit, Centro Nazionale di Adroterapia Oncologica (CNAO Foundation), Pave, Italy
7. Department of Medical Imaging and Radiation Sciences, European Institute of Oncology, Milan, Italy