Affiliation: | ∗ Department of Radiation Oncology, Cancer Hospital/Institute, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, People''s Republic of China;† Department of Medical Oncology, Cancer Hospital/Institute, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, People''s Republic of China;‡ Department of Abdominal Surgery, Cancer Hospital/Institute, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, People''s Republic of China |