1. From the Department of Diagnostic Radiology (M. Liu, Q.F., M. Li, L.Z.), Department of Pathology (L.Y., X.S.), Medical Statistics Office (X.L.), and Medical Records Room (C.L.), National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, No. 17 Panjiayuan Nanli, Chaoyang District, Beijing 100021, China.