1. From the Departments of Ultrasound (Yan Zhang, W.L., J.H.Z., Ying Zhang, H.Y.H., Y.K.L.) and Pathology (J.L.), Division of First Medical Center, Chinese People’s Liberation Army General Hospital, 28 Fuxing Rd, Beijing 100853, China; and Department of Ultrasound, Division of Second Medical Center, Chinese People’s Liberation Army General Hospital, Beijing, China (Y.Y.L.).