Affiliation: | ∗ Department of Radiation Oncology, Duke University Medical Center, Durham, NC;§ Department of Pulmonary Medicine, Duke University Medical Center, Durham, NC;¶ Department of Biostatistics, Duke University Medical Center, Durham, NC;‖ Department of Radiology, Duke University Medical Center, Durham, NC;† Department of Radiation Oncology, Fudan University Cancer Hospital, Shanghai, China;‡ Department of Radiation Oncology, University of North Carolina School of Medicine, Chapel Hill, NC |