1. Department of Radiology, Ren Ji Hospital, Shanghai Jiao Tong University School of Medicine, China (B.S., X.G., X.L., J.Z., Z.Z., X.L., Y.Z., J.X., H.Z.).
2. Department of Radiology, Shandong Second Provincial General Hospital, Jinan, China (X.G.).
3. Department of Radiology, University of Washington, Seattle (J.S.).