1. Department of Biomedical Engineering Johns Hopkins University School of Medicine Baltimore Maryland USA
2. Department of Radiation Oncology and Molecular Radiation Sciences Johns Hopkins University School of Medicine Baltimore Maryland USA
3. Department of Radiation Oncology The University of Maryland School of Medicine Baltimore Maryland USA
4. Department of Electrical and Computer Engineering Johns Hopkins University School of Engineering Baltimore Maryland USA
5. Department of Urology Renji Hospital Shanghai Jiao Tong University School of Medicine Shanghai China
6. Brady Urological Institute Johns Hopkins University School of Medicine Baltimore Maryland USA
7. Texas Center for Proton Therapy Irving TX USA