1. Department of Radiation Oncology, Mayo Clinic, Jacksonville, FL 32224, USA
2. Department of Radiation Oncology, University Hospital Heidelberg, 69120 Heidelberg, Germany
3. Radiation Oncology Clinical Department, National Center for Oncological Hadrontherapy (CNAO), 27100 Pavia, Italy
4. Department of Radiation Oncology, Yonsei Cancer Center, Heavy Ion Therapy Research Institute, Yonsei University College of Medicine, Seoul 03722, Republic of Korea
5. QST Hospital, National Institutes for Quantum Science and Technology, Chiba 263-8555, Japan
6. Department of Heavy Particles & Radiation Oncology, Taipei Veterans General Hospital, Taipei City 11217, Taiwan
7. Department of Radiation Oncology, Mayo Clinic, Rochester, MN 55905, USA
8. Department of Radiation Oncology, Mayo Clinic, Scottsdale, AZ 85259, USA