1 Particle Therapy Research Program & Outreach, Department of Radiation Oncology, Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, California. Electronic address: mack.roach@ucsf.edu.
2 Department of Surgery, Division of Urology, Howard University Hospital, Washington, DC.
3 Particle Therapy Research Program & Outreach, Department of Radiation Oncology, Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, California.