1. Department of Radiology; Qilu Hospital of Shandong University; Jinan China
2. Shandong Medical Imaging Research Institute affiliated to Shandong University; Jinan China
3. Second Affiliated Hospital of Shandong University of Traditional Chinese Medicine; Jinan China
4. Philips Healthcare; Shanghai China
5. Russell H. Morgan Department of Radiology and Radiological Science; The Johns Hopkins University School of Medicine; Baltimore MD USA