Affiliations

• ¹ Department of Radiation Oncology, University of North Carolina at Chapel Hill, Lineberger Cancer Center, Chapel Hill, North Carolina. Electronic address: marks@med.unc.edu.
• ² Department of Radiation Oncology, University of Zurich, Zurich, Switzerland.
• ³ Department of Radiation Oncology and Helen Diller Family Cancer Center, University of California San Francisco, San Francisco, California.
• ⁴ Department of Radiation Oncology, University of Michigan, Ann Arbor, Michigan.
• ⁵ Department of Medical Physics, Memorial Sloan Kettering Cancer Center, New York, New York.
• ⁶ Department of Radiation Oncology, University of Maryland School of Medicine, Baltimore, Maryland.
• ⁷ Leeds Institute of Medical Research, University of Leeds, and Department of Medical Physics, Leeds Teaching Hospitals NHS Trust, Leeds, United Kingdom.
• ⁸ Division of Cancer Sciences, University of Manchester, Manchester, United Kingdom.
• ⁹ Univeristy Health Network-Princess Margaret Cancer Center, Department of Radiation Oncology, Temerity Medicine, Toronto, Ontario, Canada.