[1] Chinese Acad Med Sci, Canc Hosp, Dept Abdominal Surg, Beijing 100021, Peoples R China
[2] Chinese Acad Med Sci, Canc Hosp, Dept Med Oncol, Beijing 100021, Peoples R China
[3] Chinese Acad Med Sci, Canc Hosp, Dept Radiol, Beijing 100021, Peoples R China
[4] Chinese Acad Med Sci, Canc Hosp, Dept Pathol, Beijing 100021, Peoples R China
[5] Peking Union Med Coll, Beijing 100021, Peoples R China