1. From the Departments of Radiology (L.J.W., Y.L., W.J.P., F.Y., H.O., X.M.Z., C.W.Z., H.M.Z.) and Pathology (S.M.Z.), National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, 17 Panjiayuan Nanli, Chaoyang District, Beijing 100021, China.