1. Department of Radiation Oncology, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China;
2. Proton Therapy Center, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio;
3. Department of Radiation Oncology, Rutgers-Cancer Institute of New Jersey, Rutgers-Robert Wood Johnson Medical School, New Brunswick, New Jersey;
4. Department of Radiological Science, University of California Irvine, Irvine, California;
5. Department of Neurosurgery, Rutgers-Robert Wood Johnson Medical School, New Brunswick, New Jersey;
6. Department of Radiation Oncology, Shanghai Hospital, The Second Military Medical University, Shanghai, China; and
7. Department of Medical Physics, University of Nevada, Las Vegas, Nevada