1. From the Department of Medical Ultrasound (J.Y.H., J.W.L., Q.L., Y.L., L.L.), Laboratory of Pathology (Y.J.S.), and Department of Anesthesiology (T.L.), West China Hospital of Sichuan University, No. 37 Guo Xue Xiang, Chengdu, Sichuan Province, China; and Department of Radiology, Thomas Jefferson University Hospital, Philadelphia, Pa (J.B.L., A.L.).