Affiliation: | ∗ Department of Radiation Oncology, Tianjin Medical University Cancer Hospital, Tianjin, China;† Department of Radiation Oncology, Peking Union Medical College Cancer Hospital, Beijing, China;‡ Department of Radiation Oncology, University of Michigan, Ann Arbor, MI;§ Department of Internal Medicine, University of Michigan, Ann Arbor, MI;¶ Department of Radiation Oncology, Ann Arbor Veteran Administration Health Center, Ann Arbor, MI |